I would guess that Air Berlin are axing the UK domestics as the past and present yields are losing them money?
Now that might be due to:
Terminal/transfer delays
UK based airlines know the UK market better
More money can be made elsewhere whilst UK interest rates are high and the resident Lo-Co's have danced the 'rain dance' to get themselves bookings during the school holidays that were massively missing?
The UK market is such that profits are made in the 3 summer months, Buster understands that the rain has at last brought bookings and income leading to survivability?
Yet another UK interest rate rise will only see a more difficult UK market. Air Berlin, a multi national operator has probably recognised this and moved spare capacity elsewhere?
You have to remember, unlike most of mainland Europe, the UK interest rates are base upon the UK economy and not that of the rest of Europe.