do you have any amps or capacitors etc. Sounds like something is drawing alot of current out of your batter. pretty rare for a new battery to pack up so quickly, if so warranty.
then check alternator.

yeah have a couple of amps running but they turn on with the stereo... getting the clutch done today so ill get my mechanic to check it out

check your interior lights aren't staying on (broken door switch) also get in your boot & get someone to shut you in there to make sure your boot light goes off when the boot closes

11 volts is flat!

A fully charged car battery is around 12.8 volts at rest.

Do you have an under-drive pulley set fitted ? (anodised alloy pulleys)

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

if car is not starting first things to check:

1. Are you in the car?
2. Have you got the keys?
3. Are the keys in the ignition?
4. Did you turn the keys?
5. Did you turn the keys clockwise?
6. Did you turn the keys clockwise enough to start the engine?
7. Do you have petrol?

Perform these first

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New toy has arrived, 1/4 mile in 11.2 sec and only 114hp!

OH FUCK!! thankyou captain obvious, thats what i forgot to do, i forgot to get in the car with half a tank of petrol in and press the button to turn the immobiliser off and put the keys in the ignition and turn them... i dont know how i could be so stupid....