everythings dead

[deelcee]

had to open the car with the manual key

no lights, no clicking, key wouldnt turn in the ignition, everything is totally dead!

how do i open the bonnet to check the Battery?

[Herbie]

Get your head down in the driver's footwell and you should see a lever to pull, usually somewhere around the bottom of the trim. If it's not there, try the passenger side.

[deelcee]

Thanks Herbie

of course thats it!!!

senile dementure kicking in

 

[BigBoomer]

Battery has died. Once you get a new Battery fitted, make certain it's charging.
Then you get to play "hunt the Battery drain". 

[BlueWagon]

this happened to me once after parking in a supermarket, turns out the negative lead simply fell off the Battery. Hope it's also as innocent for you @deelcee