Ok I set up a thread here for UK based users United Kingdom Facebook Community, hope it can help to link people up to test each others phones.
Tried the above tips regarding letting battery cool down, then plugging cable in without battery, putting battery in when Fairphone screen comes up, tried different cables and chargers which worked fine before. Getting to screen where the blue battery charging shows up but it does not have any indication of percentage and it turns itself off after a few seconds.
I will try cleaning the bottom module and if that fails luckily I spotted a friend with a Fairphone so will try
- His charger and my mobile and battery - this will show if my chargers suddenly became problematic
- His battery charged in my mobile with his charger- to see if maybe there are issues with charging itself and not the battery
- My battery in his mobile and charger - as above to find out if maybe if the battery is charging in his mobile and then works in my mobile the bottom module is broken and is the reason why my battery is not charging.
Will keep you posted.
If that will not work I will be contacting support for replacement parts as I will have tried all the tips.