vat on supplier deposit

SOLVED

We have som enew suppliers that import goods for us from over seas.

They require 30% deposit at point of order for which they send us a "quote" of the full amount £100k and we are required to pay 33k.

The deposit takes place in January, and the goods are only due to us 6 months later.

How am I able to claim the vat back in the april vat return.

We have posted 33k as a pyment on supplier account in the january date, but am unsure of where it will eventually tie up with the main amount once paid on full delivery 7 months later. 

Thanks

John