Pricing all Flexi Seasons to give say 5 days' travel for the price of a weekly season would have been clear and consistent, but it seems that was not the approach taken.
Far too much of a loss to the Farebox:
7 day season, Melksham to Paddington - £309.00
8 days out of 28, Melksham to Paddington - £843.60
8 anytime returns, Melksham to Paddington - £1550.40If you are working 2 days a week in London, have to travel in the peak, and it's the same 2 days for each week over a four week period and you can be sure of that, there might be a niche where they would be worth considering.
If I was working 8 days in a four week period, though, I thing I would see if I could work Wednesday and Thursday one week and Monday and Tuesday the net - total bill £618.00 for my 8 trips to London (and a couple of weekends I could travel too)
If I were able to start late and end late at work on my 8 days, I would spend £490.40, or £323.70 with my senior railcard.