Thanks again. I am going to ask them to do the leak down test and inspect the timing first - as long as it does not indicate a defective head I will get them to renew the ignition components (plugs NGK BP6EF, ignition leads, distributor cap, rotor arm & possibly coil). If this does not fix it then I will get them to take the head off for more scrutiny.

What is the best way to clear the flooded engine if that is the problem giving the low compression readings? Pull the fuel relay and crank with a little oil in each cylinder?