after climbing inside the boot, in 26 DEG !!! not the best idea i know! and removing the rear panel, handle and speakers I took everything off the latch and lock assembly, put it back into position and tried the central locking. the back lock went up and down as it should, which it did not do before hence having to use the key. I tried the door from inside and it opened! I couldnt believe it! no key and it opened!
got out the boot and tried it from the outside..... and it worked!!!
I could not believe it! so yes there is stil half a key broken off inside the lock but now having seemingly fixed the original problem the door opens with the central locking! HAPPY DAYS!
Also while one I had a look in to why the rear electric windows didnt work, read up on the here and found the thread on checking the solder on the ECU under the glove box, found the faulty solder, re-soldered and bobs your uncle another little job sorted!
ATB
Mike