Just tumbled across a thread on another forum, which has just been revived for similar difficulties, ... the interesting thing being a script on how to test your door lock properly before you splash out, go to the bottom of this page (although all of it may be of interest)

I had a similar issue (but no handy note) when I first bought mine, ... although purchased in Cork and it was on a Dublin plate I found out it was originally a Northern Ireland car, I phoned the dealer in N.I. and actually spoke to the salesman that had originally sold the car, he looked up his files and called me back with the number.
I take it you have tried the code you have with no success?

I have Nanocom here in North Tipp, but I am afraid I don't get to Dublin much at all.

On your door handle query there is a recent thread here you should probably look at first.

Did you renew the 3 rubber mounts / feet ? I know mine are pretty flattened and probably cause additional noise.

I have replaced the small trim to the right of the steering wheel, the previous owner having drilled it for a mobile mount, and I am pretty sure it was real veneer ply under the gloss.
Simplest job would be to polish the existing surface with T-cut or similar, many of the scratches might disappear.
More work would be to rub down each piece and multiple coats of gloss varnish. Kind of depends on your scratches, also the varnish will have aged and total refinishing might give you a lighter colour?

For the engine oil cooler I have found the BMW part No. 17228604345 size is 13.4mm x 1.78 (I think that is I.D. by thickness). And I have now ordered 10 from Latvia, supposedly genuine. If any one else wants a couple let me know. (mind you delivery to Ireland post Brexit is dire, it won't do if you are in a hurry!)

Many thanks Gilbert, I hadn't realised we were elevated to 'Classic' now. I have ordered a set. I have had to use some generic ones for the time being but exact size matches were not available locally, and as per the theme of the OP, quality is not guaranteed. With the oil cooler I have imperial and metric sets of 0-rings but the oil cooler ones are quite a fine guage and the nearest isn't near enough. The old ones went back in with a couple of wraps of ptfe tape to bulk them out a bit. I might try a BMW source for them, But the nearest one isn't very near, more internet searching I suppose.

Can be a problem though sourcing some of the genuine o-rings, elsewhere in the car I tried yesterday to get DHSE oil cooler o-rings (under the filter) and air con o-rings for the compressor and condenser from my main dealer and I was told all of these are now obsolete.

Shame about the cruise,... Beady said he had done for his camper build, but as he made his own BECM it may be that he was able to simplify things?
He did answer my query eventually, I think he just doesn't look back over the build stuff on a daily basis.

My bet would be tyres, especially if they are 13" or even 12", ... (or just possibly a wheel bearing) I have actually altered my Ifor W. to take 16" wheels because the small tyres kept going egg shaped. Jacking up each side (as above) is good advice and check the nose weight as well, even if there is a little play in the draw tube it shouldn't be a big problem by itself on main roads.

Among the other trials and tribulations of my recent excursion to Kent, I left ireland with the biggest battery I could buy which was OK but the wrong handed terminals. I thought while I was 'abroad' I would take advantage and order a Hankook............... wow what a difference! Starting the diesel has never been so easy. Really impressed.

Just a quick update, I looked it up and reckoned east coast rovers was a bit too far on a dodgy engine, I rang Tom at Rover view and he was most apologetic, A he didn't have a late model and B he was just off on a trip himself the following day. He was almost as far, but I reckoned at least he would be 'sort of' on the way home.
After the initial fright of all the lost oil etc. amazingly the engine still ran really well and I pootled about Dover without any real issues.
I removed the dipstick and put a tightly fitting length of hose far enough on to cover the vent hole, the other end just went into a water bottle that sat on the chassis rail. It caught most of the oil (unless you forgot to put it back!) and at 50 - 55 mph we made it home to Ireland over 5 days without further trouble.
In the meantime I picked up a small cheap trailer (originally for a Terex single drum roller) and collected a 127,000 mile engine from Inside Out 4x4 near Dorking. That followed us home nicely, but it's extra weight did highlight the lack of torque. So .... home now, .... and at least I have something to work with.

Thanks very much,... that gives me some options. There is a fairly local (Westgate) ad on FB but no response so far
.> The BMW M51 diesel engines usually have a long life,
my own engine only has 181k and I wasn't really expecting this degree of trouble.

I paid £550 for the 4.6 complete with all ancillaries, including engine bay wiring loom the
Generally seems to be £750 for a bare diesel!
Anyway, couple more calls tomorrow and I'll see where I am.

Thanks, I haven't come across them before, I'll give them a buzz.

Well,.. its definitely oily! .... I knew I was down on compression on number 6, but reckoned that as it still ran well enough I would risk a trip. Fact is it has been off the road for most of lockdown and this is my first trip beyond Tesco or the local hospital..... 500+km, ....4 litres of engine oil and 2 litres of coolant later.... (and one tricky moment when it wouldn't restart!) we arrived in S.E. Kent.
Most of the oil was blown out of the dipstick vent hole, .... and I found quite a bit of it lathered over the rear tailgate!
We are now in Kent for at least a couple of weeks (probably more now, but don't tell the wife!) and the best quick fix I can think of is a good second hand engine,... any good thoughts / leads / etc. would be really appreciated. I have friends and some tools and some wrenching / lifting / shifting is possible.
Any help really appreciated, ...thanks Rob

Can't help feeling the heat would see off the Loctite. I use anti-sieze, copper for iron, aluminium for alloy.

I am enjoying the thread, ..... I always thought I might move on to an L320 or 322 eventually, although the reality now is that I can't really afford to.
Just on the transport theme I wondered whether I could get one delivered about 3 months ago and save myself the fuel and ferry etc. only problem was my quote was somewhat more substantial, more than the vehicle concerned would have cost! And that boat has probably sailed now with Brexit anyway, hopefully things will settle down a bit in the future but in the meantime even ordering spares from the UK is now a much more expensive prospect.

I'm impressed!, faced with stuff thats all plastic dots like that I wouldn't have attempted it but in essence it seems straightforward, if my windows evver give trouble I might just have a shufty.

I sometimes check out France for that sort of stuff having lived there, [P38 H'lamp] (https://www.leboncoin.fr/equipement_auto/1879542999.htm)
Found this one straight away, I am sure you would get the other one with a bit wider search.

As a recent member myself I will say there is great knowledge on here and willing help, ... sometimes all you need is the right clue, but if you need more it is there as well, check out the recent thread on fuel guage/instrument pod for example.

Great, thanks. even I shouldn't have any trouble with that guide