Maybe I should clarify, we charge £20 for a disc brake service, per brake.
It’s not just bleeding, the fluid is flushed through and new replaced, lube pistons where possible, face the disc mounts if nessecary, check pads for wear.
I prefer to charge full whack and do the job fully, we either do it fully or not at all, you can’t make errors or mistakes with hydro brakes. A quick bleed may not find other brake issues that are present. We could end up liable if an accident occurred as we would be deemed liable once we have worked on the brakes.