Hi again chrispb123456, I FOUND IT!!!! lucky i keep bits in a box, somtimes whether i need them or not, you know like the rawlplug you didnt use and put in your pocket, then it goes in a drawer... well thats what i did with the "Transponder", and after fitting back inside the key the car now starts and runs!!! THANK YOU!!! So to anybody else searching, the bit, a little black rectangular, 8mm x 2mm x 2mm approximately! is the Transponder, which you need inside the keyfob, in the key part, for the engine immobiliser to communicate with the key. you learn something new every day... lol. D.