I reckon Heathrow isn't the only place where you can look like a bumpkin if you're not used to it. In the days before 2001 when I was staff and a jump seat was sometimes the only way of getting A to B I can remember several crews getting off a runway at a range of airports and then fumbling for ground charts as they tried to work out where to go.
And there was a rather memorable occasions when we were heading for a stand (call it 218 - it was somewhere along the line between T1 and T3 at LHR I can't remember the actual number) and as we began to turn the copilot said "Why's he waving at us?" and there was a batsman in 218B (which was where it turned out we were supposed to be). Even the locals can get it wrong occasionally!