Use of Air Miles for Upgrades
One of the snags with booking with a Travel Agent is that you cannot redeem some carrier's Air Miles for upgrades etc. This is the case with BA, where you have to book through their website or over the phone direct to redeem air miles for upgrades. This is a little frustrating when, for instance, your company contracts a travel agent to make all bookings for work travel and you then wish to upgrade using your miles. Not possible.