Not really as they vary enourmously depending on when you book, what cabin you book in, which flight/routing you take, terms and conditions like whether you can cancel or change the booking and what fees would be involved, where you ticketed the flight, the agent you used and whether any corporate or shareholder discount was available.

Apart from that it's easy

There is some information on the lowest (i.e. sale) fares that have been available over the last 12 months here: http://www.flyertalk.com/forum/briti...les-ex-uk.html