Hi Staddly,
Yep I've done my interior bulbs.
This guy on Ebay sent me some good led bulbs:
http://stores.ebay.co.uk/serviceyouaaaaa/Car-decoration-lights-/_i.html?_nkw=Festoon&submit=Search&_fsub=2654751015&_sid=999151565
Free postage also.
The 2 map lights and the centre roof light are festoon bulbs, 5W, 31 mm I think. The covers all pop off with a screwdriver covered in a cloth. Pop an existing bulb out to measure, pretty sure its 31mm.
The 4 puddle lights at the door bottoms and the 2 boot lights are all 5W 501 fitting. Again covers pop off with care.
The give a nice white light, better than the old yellow.
Sidelight bulbs are 5W 501 fitting also.
Need to upgrade my headlamp bulbs to match the whiter side lights, but will probably go with white Phillips or Osram nightbreakers, not LED.
Wont do the indicators as I've heard you get errors with these, quick flashing etc, wont bother with taillights also.
cheers
Rich