Hi John,
Sorry didn't have chance to do this last night. I'm not sure what’s going on that week but all the prices are really high compared to previous weeks, looks like Corfu may be busy in September.
The cheapest on our systems is around £144 CFU-MAN (taxes included) on either 2nd September or 5th September, both leaving at 5am, that is flying with Thomas Cook. Ran a quick search on Monarch, TUI, My Travel and everything was more expensive, couldn't check First Choice but they usually don't sell one way from Corfu.
I even checked the scheduled carriers (Olympic via Athens) and they were all over £200 each way. I would normally suggesting holding on until the last minute but if prices are this high it must be due to demand. You could always try independent websites that I can't check here such as
www.cheapflights.co.uk as these seats are bought in advance, but often additional costs aren't shown until the end.
Good luck anyways
Joe