Originally Posted by
irishguy28
Anytime I've been re-routed from LHR to LGW, I had to pay for the coach upfront.
Given that the OP probably won't have a lot of time to faff about, I would recommend just buying the ticket, travelling to Gatwick, and submitting the ticket with a claim for reimbursement after the trip is completed.
Well I ended up buying £30 in YYZ with my credit card. Once I got to LHR I went to the BA desk and she gave me a ticket for the coach right away. The two agents in Toronto who told me I'd have to pay for it myself were not informed of that.