Right here goes(pictures to follow)
Total time for fix is about 30 minutes and tools needed are: Philips screwdriver, 20, 25 and 30 torx (cant remember if i needed them all), New boot release Solenoid (i will update with part number and was £15 from Seat)
1. Remove parcel shelf and trim on drivers side of the boot (3 screws 1 of which is next to the back seat catch so pull the rear seat forward). If you remove the cover for access to the light cluster and look towards the 1/4 panel (before removing the complete panel) you will see the solenoid (white about 5cm by 4cm).
2. With panel removed (well not completely removed as the seat belt goes through it but no need to take this off , just move the panel out of the way) you will clearly see the solenoid that you want to replace. This is attached by two philips screws that you cannot see the head of, because the way the solenoid is attached is that (difficult to explain this one) the head of the screw on the solenoid will fit through a hole and is then slid towards the rear of the car to lock it in place. So to remove you need to push it towards the front of the car to release it. Also remove the electric connector by pushing the two little plastic pins at the top of it (same as most of the connectors on these)
3. Now i removed the fuel cap to replace mine but looking back i dont think this is required, but easier to feed the rod on the solenoid through. There is one star piece inside the fuel flap (oh yea if the flap is stuck closed then with your finger pull the flap out a little bit and carefully use a flat head screw driver to push the lock mechanism which will release the flap) and after this is removed the rubber filler neck and flap can be easily be removed as one piece (pull towards you at catch end and the hinge will then come out).
4. Now the solenoid should have 2 new philips screws on it already which you might have to tighten up a little (have a look at the one just removed and leave the same gap) and after feeding the rod through to the flap area (there is a little tube that it feeds through and is a little fiddly to do and might be worth putting a little bit of WD40 in the tube to
help it move easily) the solenoid is fixed into place by lining the holes up on the mounting bracket and sliding towards the rear of the car to lock in place
5. Reconnect the electrical connector and test that the release is working and then refit all parts removed.
Hope this helps