how do i bypass emobiliser pug 406 1.8 petrol p plate?

we went to a gig out of town and our immobiliser packed up.AA ending up taking us home.in turns over on the key but beeps.have been told it has been wiped .god knows .please help .if i input code it wont accept and after three attempts it beeps continually. i dont care if we lose immobiliser need car for hostpital trips. thanks people.please email info to my name as below and insert the at simbol and no spaces .hehe