[loki_the_glt]

Check the battery connections are tight - slacken off the bolts and re-tighten them and do the same for the other end of the earth(ground) lead; and check the engine earth strap that runs from the cam-cover to the engine compartment bulkhead (firewall) is tight. Then try starting the car again, having first charged the battery if necessary. It might also be worth checking the starter motor connections are tight at the same time.

Further diagnostics are dependent in part on the engine - B200 or B230A or E or F (A models are carburettored, E and F models are fuel-injected) - as there are different causes and cures for the two groups. If it's a A model it won't have an electric fuel pump as standard, but someone has fitted one.