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Sounds like bollocks to me. Spark plugs can't corrode to any significant degree, or at least they shouldn't in normal use. Coil packs on modern cars are covered in plastic and the only bit to corrode would be the terminals, which could be cleaned up easily if necessary. Sounds like BS to me. Ask them what the OBDII fault codes were.
P.S. Plugs are indeed cheap. Coil packs can be quite pricey, especially as some cars have four separate coils but bundled together in a single pack, so you have to replace all four.
Brommers-
Further to this, I got an bluetooth ODB2 connector from amazon (Torque Pro), with the Torque app. Mostly got it so I could have charts flying around as I drove, but it's a really cheap way to show all the engine codes and what they mean (including clearing them if you want).
You can then do a bit of pre-garage googling. It was about a tenner all in.
christianSpaceman
Random question: our car went in for a service the other day and first trip after it came back Mrs Sparky said it was spluttering and juddering and the engine warning light came on.
It’s gone back to the garage today and they’ve told her “corroded coil and plugs” and quoted £500. Not a single issue before it went to the garage.
I’m going to call at lunch. What do you guys think? Anything I should be asking? Sounds dodgy to me. Plugs are a few quid, right?