Ian, that must be annoying.

I know nothing about Roadsters or how to bypass a Roadster immobiliser. However it might be worth dropping the column shroud to identify the type of immobiliser antenna ring used. If your Roadster has a Ford ECU it might use one of these Ford PATs electronic modules below.

This module appears to be used across a few Ford variants that use their PATs system. It’s a potential fail point so I keep a spare ready for that day. I picked up my spare on Ebay for a tenner by searching on the part number.

Good luck.

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Roger
2011 Plus 4