I throw mine at the local dealer as it's a 5 min walk from my office. It's about £150ish I think.
Decent oil is £50+, a filter is £18ish, so it's over £70 for labour. Quite a lot for 10 mins work, but sometimes I just can't be bothered to jack it up, remove the under tray, get dirty, take the old oil to the tip etc etc. And I get a dealer stamp in the book, which buyers of the limited editions get very OCD about.