Thanks for the replies, I spoke to local ford dealer and they wouldn t guarantee to tell me which lambda sensor it was from diagnostics and wanted £65 as well. I ve replaced the front lambda (pre cat) had it re tested still failed and light came back on again after about 200 miles. So Im now left with either replacing the other sensor or the cat. I read somewhere that the post cat sensor is the same except for the plastic lug on it. I now have a spare pre sensor, any chance this can be used as a post cat sensor?

RSBENJ1 That is a very generous offer, how much do you think postage would be and when could you send it? thanks again. Also does it have the lambda sensors in still?