yeah id try push/tow starting it (igniton on 2nd gear) if it fires up then your engines fine,
if it dosnt and makes some strange noises etc id take the cambelt cover off and just check the belt is ok and on, just for obvious things as sometimes mr aa men are in that much of a rush they dont look into every thing,
if the car does strat on the push/tow but get a voltimeter and check the output going to the battery from the alternator, this should be 13.6-14.2 volts whilst the engine is running, if not tit would idicate tat the alternator isnt charging properly. if voltage is with in them amounts above i dont think thats the prob, if the starter is new then surely it shouldnt be faulty so id look into a bad connection (crimped connection) on the ends of the wires to and from the battery to the starter and alternator, and the earthing points, (normally through the engine/box, which inturn earths through a cable not sure hwere it is though to the battery/chassis)
this is where i think the prob maybe??
Gaz
