Hi, I've been getting a cruise control fault message on my F55 although the cruise control itself seems to be working fine. I took it into my local dealership naively thinking they would investigate the fault free of charge under warranty. No chance - they wanted the best part of £80 to run a diagnostic and would only waive the charge if a fault found. I can see this one going round in circles so is this common practice and I just have to pay up hoping they find something?

Thanks!