I fail to understand why the baby 737 was holding at S2 when it had been cleared to hold at T1 for "some time". "Some time" seems to have been enough time to comply with the ATC instruction.
Holding a few metres short of the allocated point is one thing, but this was tens of metres.
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In general, unless the taxiway centerline ensures clearance from all aircraft types holding where instructed then this sort of incident will proliferate. The centerlines and holding point markings should serve to assure of adequate clearances provided that pilots use them as instructed in the Air Pilot or as instructed by ATC. Non-compliance equals negligence, does it not?
The "Heathrow Getout Anouncement" just is'nt good enough. It's becoming impossible to judge wingtip clearance from the cockpit on some types.