Recommend Opie Oils down at Redruth in Cornwall for quality and price.Available via internet.
Rear axle: Big filler hole is best accessed down from removed rear parcel shelf. Make sure it will come undone before draining! Draining best accessed from underneath. Jack up car to belly under & remove drain plug, then lower to ground to allow last bit to drain. Raise again to replace drain bolt with some ptfe tape perhaps , then lower to refill until fluid just starts to run out of filler hole.Replace filler plug again with a bit of ptfe tape if you like.
Note, you may or may not have a LSD axle. When jacked up, rotate one wheel. If the other one goes in the opposite direction then it is an ordinary axle but if it goes in same direction then its LSD. Correct oil for LSD is essential. I use Castrol Transmax Limited Slip LL 75W140.
Cam belt should have been changed long ago as they are time and mileage dependant.
Brake linings and pads should be fine at that low mileage but check pistons in rear slave cylinders are free to move as they are prone to seizing up. If they are ok, pull rubber boots back and apply some Ceretec grease to the pistons, to help keep them free and clear of water ingress.
