update on this..
i got it sorted, i took it to a local garage and he took off the door lock ,the sensor is in the lock itself, when he opened it up it was just a little plastic spring that got jammed.He sprayed it with copper grease and said it shouldnt happen again!!! 60 quid was quoted for 20 min work but i suppose it had to be done .i told him if it goes again i will be back in and could he remove the spring altogether at no cost, and in fairness to him he agreed.
when i saw the inner workings of the mecanism it is fairly niggly.oh the french...
cheers for the replies folks