Disco 3 (LR3) HDC TC and Brake light

Earlier this week My 2.7 tdv6 Disco 3 i was acelrating away and those three lights came on with fault message and doing some research i decided it was brake light switch so replaced it . On star up all lights go out but at about 20kph all come on again put nanacom on and got can bus failiure to comunicate. did more research and could not find any thing about that fault. The next mourning the battery was flat so( it is less than a year old EXIDE ) so i thought i had found the problem again so had RACQ bring out new battery and fitted ($400 )and as Christmas eve i could not get hold of anyone that serviced Exide but had to have car i had checked battery and was charging at 14.1 volts before that happened but this time it was 10.1 when i went to start. Ok i thought that was the cure to problem but no all lights on again. did some more research and found that steering angle sensor out of calibration can cause the fault so recalibrated with nanacom and fingers crossed it worked for at least one day now. i think the duff battery caused all the problems and sent the SA out of calibration. apparently faulty or incorrect brake light bulbs can also cause this problem.
I know it s not a Range \Rover as such but it is a Range Rover Sport in disguise

Did you change the brake light bulbs?

The exides arent much cop, mine didnt get much past 18mths old.

Probably fluctuations in battery voltage, there very sensitive in that area