I'd like to replace with LED all the lamps it is safe or practical to (I guess this means the cabin ones).

Any to avoid or any recommendations?

All the interior ones are easy as there is no warnings on them.

Currently I've replaced pretty much everything on mine. The only exterior ones I've done are the side-lights, the yellow side markers for the indicators, and the number plate lamps. I swapped these with 'Canbus error-free' lamps as they have additional resistors to fool the lamp failure circuitry.

I was going to look into doing all my other ones aswell, but the need for power resistors defeated the purpose for me - It is on my list to see if I can tweak the BECM to allow LED lamps and not show an error, but I haven't even got started on that project yet!!

I replaced the loadspace lamp with a pair of these:
SMD LED Panel

2 of them just fit nicely in the cutout in the tailgate hatch, without any cutting required.

I am looking at cutting a hole identical on the opposite side and fitting another pair in there as the light is a bit one-sided at the moment!