Thanks for the advice guys, I finally got it off! The method I used was: put it on the gas hob for 5-8mins using some wet gloves to handle it.. After this I picked it up and ran through the house into the garden where I had a hammer and a spanner waiting.. After placing the spanner on the lambde sensor and beating it like a cheap hooker with the hammer, it eventually moved! I had to repeat this 3 times for it to come loose to the disappointment of my parents who were waiting to use the hob..:dapprove:
So thanks again guys for the first class advice..