Originally Posted by
Engineering Travel
I would advise caution in paying ones own travel on business, check with HMRC, as you potentially have to pay tax on the reimbursed costs, then claim that back via self assessment.
Business travel for business purposes isn't taxable for the employed in the UK.
1) If my employer is paying the bill I'd go on the most beneficial route for me time wise, while seeking to maximise Avios and other hotel rewards along the way.
2) I'd be booking as late as possible to ensure I'm reimbursed before my credit card bill is due.
3) I wouldn't be taking on any exchange rate risk.