Discovery 1 power steering pump went out. Having trouble with the top left bolt on the engine housing getting it loose. Put the wrench on it to break it loose and it started to round off the head of the bolt. Not enough room to get any kind of socket on it. Any ideas how to get that bolt loose will be appreciated.

 

Can you get a flare nut wrench, get a metric and SAE I believe it was around 10mm or 7/16? Correct me if I'm wrong. Great idea wasn't it.