If you have a swarm of honey bees a local beekeeper will be pleased to come and remove it for you.  It is a service offered which may or may not involve a charge.  First, you need to check that your 'swarm' are indeed honey bees.  A wasp's nest, for example, will need dealing with through your local council's environmental health or pest control department.  Honey bees are much darker than wasps and if they have coloured bands on their abdomens, these are usually orange/brown or golden in colour – quite unlike the common wasp which is mostly yellow with black stripes.  The swarm itself will probably be about the size of a full-size rugby ball.  It is comprised of bees clustering tightly together; those bees on the outside will be moving around.  In the air will be a small number of bees flying to and fro.  These are likely to be the 'scout' bees looking for somewhere suitable to set up a permanent home.  The swarm will hang in a tree or a bush or under the eaves until they have found the kind of home they want.  This could be your chimney stack!  So It is important to take steps to have the swarm removed as soon as you can. 

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Whatever you do, don't delay.  Those bees will be on the move into somewhere more secure as soon as they find somewhere suitable and by definition, will be much more difficult and potentially expensive, to extract them from.