Update: Ok i've resigned myself to the fact im not going to get away with having the brightness on 100% so ive set it to auto.
Also ive just figured something... Ive got beautiful widgets installed and have the weather running from that set to every 3 hours, however ive just checked the standard weather app and it was set to every 30 minutes.
Could this be why my battery has been reducing through the night???
Have nearly charged again this morning. I'm popingout this afternoon so going to navigate a 30 minute journey on maps.
Will report back