Tax scenarios in UK

Hi,

I do business in UK and need to understand various tax scenarios wrt to P2P flow.

1)I procure goods from a supplier in UK.

Standard Vat(20%),Reduced VAT(5%) and exempt will be applicable for P2P transactions.

2)I procure goods from a supplier in EU but not in UK

What will be possible tax scenarios for this purchase?

3)I procure goods from a supplier not in EU.

What will be possible tax scenerios for this case?

Thanks

AJ