Sounds a bit steep but if you used the man dealer then probably about right, are you sure that's all the list of parts.

Odd that you should have had new front pads fitted when the discs are heavily corroded (assume need renewing), presumably they are not corroded too badly and can service another set of pads before needing replacement.

IMO if the front discs were badly corroded enough to warrant an advisory, then they will almost certainly have been in need of replacement or soon will be. In that case fitting new pads was a false economy as you will be needing new set again when you have the brake discs done (which IMO you should if you've been advised - safety third!!).