... and everything in Dublin is expensive!

The whole job shouldn't take more than an hour of labor: taking it out should be 10mins or less; putting in a new one should be less than 30mins. Unless it's an absolute pig or stuck or something weird... maybe they're just quoting for the worst-case scenario.

I took a stripped down frame to my LBS just to get the Shimano cup BB out, because I didn't want to buy the tool for it, and they didn't even charge me - because it took literally 2 mins to do. Then again, they know I'll come back in to buy cables and housings and seatpost binder bolts and stuff like that.

I'm actually quite happy to pay more for good service, people deserve to be paid for their work. So if you like your LBS, then it's worth it, they'll look after you in the future.