good news, it is a bayonet fit bulb, bad news it's instrument panel out. You have to get one of the screws from inside the fuse cover after taking off both halves of the steering column shroud. there are 3 upper an 2 lower screws as well. I have never done this, this is from Haynes manual and it looks a bit fiddly
ive done this annoying job its gets esier evry time you do it lol any car spares will have the bulbs buy about 10 of them they only cost 50p each and change them all whilstyou have the speedo binicle out its a bit fiddly but take your time and dont loose any of the small hex screws like i did good luck with it