Southend 757's
Back in the day I recall a Canada 3000 757 which had been on maintenance going direct from SEN to Toronto with just the crew on board, and it only used about half the runway to get airborne so maybe with a full pax load 757's could fly to European destinations once the runway is extended. I think the real problem is the runway and taxiway widths and ground facilties e.g. steps and the like.