[pacman67]

To update with my findings, car came to me having had a "new"abs and pump fitted and car showing anti skid service. Took it to independent who couldn't sort it, however they did not try the download update as described in Vida.
It is possible the unit was used and therefore programmed to another vehicle as the error on Vida was unknown configuration, whether the software update would resolve this I don't know. I've now refitted the original module and all is well. Talking to RUFE, it seems dealers may be able to flash units to clear them of previous vehicles data, I personally think they would not do this as would involve used parts. My local dealer would not even look at my car after it had been elsewhere.
So, yes I agree that great caution should be taken when purchasing second hand electronics.