Thought I would update with the conclusion.
The battery was fine after all, after a lot of driving , 200 miles I would say the start & stop came back!
Sick of going for battery tests at kwik fit although the guys at nuneaton were really brilliant helping me!, telling me the battery is probably fine, just keep driving it and come back for another test,
Issue was not knowing how to measure how well the battery was charging or retaining charge.
I bought this little gadget
Which gave the understanding of what was happening with my battery after each drive and after leaving it idle over night, I could see what the problem, I stopped going to kwik fit for tests, so I highly recommend getting something like this, every morning I would just plug it in and check the level before I turned the car on.
I took the dog out for a walk early one freezing morning, and saw 2 people having to jump start their cars, I thought oh god, but I tried my car and it turned over straight away, that gave me confidence, few days later I went on Holiday left the car on the drive 7 days and no issues starting it.
Thanks for everyone's advice, my advice buy one of these little gadgets to check your battery they really do work.