Well Barry, you've replaced the camshaft and crankshaft sensors both of which have the potential to prevent the engine from starting. You've proved that the fuel pump is working and so is its relay. You have petrol in the tank yet no fuel escapes when you briefly depress the plunger in the Schrader valve.
I think the evidence points to the filter assembly don't you?
Congratulations on owning an AVO by the way!
Simon