GayFriendly
With regard to any special deals that FR did with BHX, I seem to recall they chucked the proverbial teddy out of their corporate cot many years when BHX withdrew a deal they had at the time, and they ran a very limited network with included Gerona and Reus.
They then, of their own volition returned to BHX, without a special deal. I doubt they got many favours financially from BHX when they returned a few years ago, and if that is the case, then that may go some way to explain their expansion at rather more generous (desperate?) airports. I don't know but it wouldn't surprise me if they returned to MAN more through commercial necessity than because of a spectacular deal from MAG.
I guess we'll never know.