no start no crank after button pressed

i have a tdv8 3.6 2010 and it will not start tested starter and works fine no power to fuel pump also tested and works fine

Is there an aftermarket immobiliser fitted? do the dash warning lights come on? do the brake lights work?

no aftermarket alarm you put fob on centre console press start button nothing happens dash is lit .it says press brake to start when you do the ignition turns off . brake lights work ok switch renewed if i give 12v to the energizer wire on the starter engine turns over but does not start . no 12v feed to fuel pump

Then it sounds like a problem with the brake pedal switch or wiring, there are two sets of contacts, one normally open, one normally closed. If the two do not change state correctly then you'll get the symptoms you describe in your second post.
Are you a trader?

im a retired mechanic mot tester not in the trade anymore .i renewed the brake light switch still same if i feed the tank pump with a live feed and also give a feed to starter it will run .otherwise just turns off

Does the fuel pump run for a few seconds when the button is first pressed?

no it does not receive any power even when turning over the engine using the exciter wire

Any DTC's stored?
Have you tried a battery disconnect / reconnect?

no codes tried battery i wiring diagram of the start circuit would be helpful