In the end having decided to get a new battery I discovered that mine was still under warranty and I got a new replacemnet. At the moment its certainly starting easier but I'll see if the drain issue stops or not.
I bought it from Euro Car Parts and having lost the original receipt I showed them my bank statement with the transaction from April 2013 and they accepted this, after checking their system, and replaced the battery, which is pretty good customer service in my book.
Now that I am blabbering on I might as well add this, Bosch make SO3 SO4 SO5 batteries and on their site state that SO4 is fine for middle range cars. But there are several SO4s and I need SO4 005, not SO4 063. I dont know the difference or if it matters and even after Googling I am none the wiser....But it seems that it would have been easy for me to buy the wrong one.