Ford Focus won't start / turn over

Test battery , check voltage .Try jump start .

As advised jump start but you could also try a bump start.

Thanks for your reply, I'll try a jump start. I don't have the tools for checking the electrics. Although I'm pretty sure that the battery is not dead.

Battery doesn't have to be dead to prevent starting .Don't be mislead by lights on dash , means very little .

I've come across these where a non crank is due to failed coms between various modules with chips in the vehicle.
Anything with a chip that isn't communicating back to the main ECU will cause a non crank.

That's why I suggested a bump start.
They usually WILL bump with this fault.

On some models the ignition capacitor can cause this .Small capacitor is a square box about 1 inch, black in colour with two black wires going into it. Usually mounted on a bracket with one wire grounded to the body on top of engine .

Where is this situated and what's the usual cost for a new one?

Just went to jump start the car off my son's car. Turned ignition on, turned key and it started all by itself.......no jump required. Don't know what had happened but all is good now. Thanks for all your help and advice.

Thanks for update , glad you got moving again .

Clean the inside of the battery terminals and the outside of the battery posts.

this is dead common it will be a dry joint in the instrument cluster

that will be a instrument cluster fault .A dry joint on the board i have repaired loads of these they just need resoldering.