A/c off those stands usually face west, taxi west on Bravo (try and avoid Alpha, that's where the inbounds are vacating!) and then go south on Echo, then right on Alpha to HORKA. Or, if it's busy on Echo and Foxtrot, or a towing a/c is coming eastbound out of the north of T5 going to the BA maintenance base, then they might face east and taxi Bravo/Link29/Alpha to HORKA. Usually, the key to GMC at Heathrow is keep things moving, rather than everyone getting the shortest taxi route. That's when it tends to grind to a halt.