Friends, Romans, countrymen, lend me your ears.......please

Has anyone either completely removed and or disconnected / disarmed the immobiliser on an escort RS Cosworth?

I have a 1993, L reg, large turbo Cosworth who's original Ford immob will no longer let go, it seems the old girl does not want to go any further and is having the last say on the matter, or at least she thinks she is.....

Tried shouting at her, threatening her with a stick (Basil fawty style) but no joy. No lights on dash just the immob sounding that beep saying "think again sunshine".

Cheers

Ross