VAT timing Query re Recharge Invoices

Client Registered (late) for VAT and had issued invoice post registration date for recharging expenses incurred before the registration date.

Luckily the client identifies the individual expense details and dates on the Sales invoices, these in include accomodation and fuel etc so they are not disbursements

However logic tells me that no VAT should be due because of the date the expenses were incurred but would appreciate confirmation.

Grateful for any reassurance - Thanks