Went to do the SR's first oil change today and have managed to (quite badly) damage the drain plug. The plug didn't move at all so it's still sealed but I've rounded a few of the nut corners:
I have a new drain plug and oil seal, any tips for getting the old one off?
I only have 'simple' tools (normal / ring spanners, socket set), how much would I expect to pay for a garage to remove it if I can't?