If your timing belt had gone then you would hear alsorts of strange noises when you spin the engine over (piston clouting valves etc) i would say its more likely its slipped. but hard to tell if you were driving along with no faults
is your lift pump lifting fuel?
is the fuel solnoid opening? with bonnet up should be able to here it click when u turn the key to the point before starting
is the engine turning over when u turn the key?
i am resenable local (near hemel) and have the timing kit tools, but sadly i dont have a car at the moment if your not in a rush then i can help