I know its cold, and that doesn't help, but I went out to check the tyre pressures and faffed about in the boot for about 5 mins after which when i went to start it I got the low battery start car message. It did start but not convincingly so it's currently on the Ctek.
In fairness, it is a 6 year old Bosch so owes me nothing but maybe time for a new one.
I have thought about one of these two, thoughts would be appreciated (I can get 10% off the Halfords one);
https://www.tayna.co.uk/car-batteries/exide/ea1000/
https://www.halfords.com/motoring/batterie...html?_gl=1*1hrxd7k*_up*MQ..*_ga*MjczODgzMTk0LjE3MDE1MzUyNTI.*_ga_VK44BRER97*MTcwMTUzNTI1Mi4xLjEuMTcwMTUzNTI2MC4wLjAuMA..*_ga_XXXXXXXXXX*MTcwMTUzNTI2My4xLjAuMTcwMTUzNTI2My4wLjAuMA..&gclid=Cj0KCQiAyKurBhD5ARIsALamXaHPT8Q3v3UgjtfQDMD97-r6Y23-1REe1ucYfHK8CatFwrisuo4C-acaAuiaEALw_wcB

Very quick update, my lad was at Halfords when I whatsapped him, he picked me one up for £117 so I'll pop it on in the next couple of days.