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The only place for a coil spring is up Zebedee's arse
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Same question, but which battery should I get for my 2.5dse?

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Hankook MF31-1000. Currently shown as out of stock at Battery Megastore but shown as in stock at Battery Factory see https://batteryfactory.co.uk/products/hankook-mf31-1000-643-644-heavy-duty-starter-battery-12v-ah115-cold-cranking-1000amps

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Many thanks, so you recommend the same battery for both petrol and diesel. I'll also get one ordered.

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It's the biggest, most powerful battery you can get that will still fit in the space available. It's over-specced for the diesel (RAVE recommends a 107Ah battery) and well over for the V8 (where they recommend a 72Ah) but for something that needs the best battery you can get, it's better to have one too big than only just big enough. Someone, I think it was Tanis, fitted one to his diesel and reckoned he was going to contact DVLA and tell them he'd converted it to hybrid with the speed it cranked his over......

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Question related to the above ... last time I was by my battery supplier we engaged in a conversation about the subject of the "bogger is better", of which I am an advocate, and "fit what is specified" which was his opinion.
We were not talking about the P38 in particular, but about a normal car and regular city car use.
Hi statement was grounded on the basis that a higher Ah battery might take more time to be filled to its capacity by the standard alternator, and therefore in short runs never reaching total charge and shortening battery life.
As I have never seen this matter from this point of view, you guys running +100Ah batteries in the V8s, do you reckon a shorter battery life due to this problem?

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The important word here is capacity. Think of the battery as a bucket. Designer says it will use 1 litre per hour running and the alternator can put back a maximum of 1.5 litres per hour (V8 with 72 Ah battery and a 120 A alternator). If you have a 1 litre bucket and the alternator isn't working, the bucket will be empty after a hours running. With a working alternator it will always stay full. If you have a 2 litre bucket it'll run for longer before the bucket is empty but with the alternator working you'll still be taking the same amount out and putting the same back, you've just got more of an overhead in case the alternator isn't up to scratch.

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Gosh, I thought it would be harder ... duh, guess I wasn't thinking hard enough :-)
Thanks!
When my Tenax 91Ah gives up (close there), will look for the largest I can fit there..

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Century are the premier battery manufacturers in Australia (in my opinion). This is from their site, some interesting comments. FYI:

Century FAQ