Six months in and I have finally found what is wrong with it, well I say wrong, its a thing that can be sorted very easily.
It is too fucking hot. Its nearly 1am and I feel like I am at a beach at noon.
I have stripped down to all that is decent, but it is too hot, the problem I have found is by opening a window, it gets too cold to quickly.
Plus side of this, is if this is the only thing I have to complain about I am doing pretty good, also when we use to live in a different flat due to the way the heating worked in other flats, I spent £20 on warming the flat for 4 months over Christmas, it was that hot.