Yes, the ABS sensor (rear offside) showed as a fault on the garage's code reader, and that fault has now been cleared and removed. No further codes are showing on their machines, however the lights are still on the dash.

I mentioned ABS module, but yes, CAB was the part that was cleaned. I'm sort of resigned to the fact that I'll need to get the vehicle on the Mercedes STAR system or similar - just hoping I can find one local rather than the stealership. The car no lnger has a valid MOT hence the need to try and locate one nearby (or alternatively a mobile diagnostic if the price isn't too steep).

Thanks for your help.