Astra G 1.8 16v Petrol (2000) - iol pressure problem - thata

I have changed oil pump, oil pressure switch, big ends bearings but still there is no oil pressure. no oil passes to the block

Astra G 1.8 16v Petrol (2000) - iol pressure problem - dadbif
Blocked oil pick up? Oil pickup pipe not sealed to block? Sheared drive to oil pump?