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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,084
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
A quick spray of petrol and a match will sort it...
Seriously though, it sounds like they are swarming to find another nest. They are aggresive because the queen is in there somewhere so they are protecting her.
Your local council will be able to help, and will most likely put you in touch with a local bee keeper who will be able to get them into a hive and take them away for you.