Posted: 02/07/2013 at 14:20
If they are honey bees you should be able to see some honeycomb. They will live there as long as the queen lives or, if they like the site, a new colony may develop. They will also swarm when the weather turns hot(!) and start a second colony, maybe in a neighbour's garden.
if they are bumblebees they are "annuals" and will all die in the winter, except for the queen who will hibernate and next spring find a new home.
Wasps are also "annuals" so killing their nests is stupid as they will all be dead in a few months and they are fantastic at eating all kinds of caterpillars and greenfly While they live.