Myself and Rick The Pick have the ability and special software to reset your Becm and disable the Immobiliser, Alarm etc. etc.
Rick is based in the Brighton area and I am in Ireland. You would need to remove the Becm and get it shipped to either Rick or myself and it would be a same day turnaround from when it is received to being sent back to you.
Rick may be able to do it "Onsite" but obviously you would have to pay travelling costs.