My own view, is because you can only top up 50%, I would try to find the difference (£500) myself by robbing Peter to pay Paul. I would have the £750 NVP credited to my bank account. The reason for this is, I’m not sure how £750 the NVP will be treated if you use it agains’t the AP – will you be refunded £250 into your bank or will your grant reduce by £250 if the NVP is used. I don’t know basically.
If you can find the £500 to top the grant up 50% that is the way I would go and have the rest go into your bank 🙂