Agreed re discs and pads being a staple of the "you will need them soon" school of cobblers.
The ML is big and heavy and I like late braking and roundabouts. I got warned about new ones being needed twice (annual service!) before I got mine done. Next service I got the same rubbish and asked for a quote and then quietly chuckled at the guy in reception. I pulled up the order for the EBC front discs, pads and Brembo armoured car rear discs and showed him the date. Suddenly I was told that the workshop must have made the note on the wrong cars service manifest. Started using Tim Purslow the Indy after that.
(I was wrong re the Battery, 220ish for the item, fitting, coding and VAT on top of that.)