Hullo Pommyboi.
I haven't got as far as the map! I'm not so concerned about the price because my routing is largely fixed. I'm more concerned about the ticket T's and C's (flexibility; refunds; is it compatible with the ticket I have, which is a promotional one; how far ahead do I have to book etc?).
I think it is very unhelpful how little information on the Visit fares is available. Even before the wonderful interactive booking tool, the OW website used to have the full T's and C's for the Explorer fares to download. I'll have to ring BA tomorrow to get a decent answer. I'll post what I find out.
FYI, I've not had anybody reply on the BAEC website, which is a surprise. There's usually always somebody who has used a fare, no matter how obscure!