Re: Graceman - Thanks for your suggestion. Presumably you're...
@glennc - did you get anywhere with this? As far as I can tell, the only 'correct' way to do this is to enter 2x expense lines as :-
1. Mileage rate (non-fuel portion)
2. Mileage rate (fuel portion)
And then apply vat at 20% to '2.' and no vat to '1.'
The article here seems to explain : https://www.millwardmay.co.uk/quickbooks-vat-on-mileage
Unless it's possible to alter the vat rate on expenses, do you know? Quickbooks doesn't seem to have an inbuilt solution to this, does it?