http://www.direct.gov.uk/en/HomeAnd...eetcleaninglitterandillegaldumping/DG_4018684
There aren’t specific laws against having a bonfire, or when you can have one – but there are Acts that deal with the nuisance they can cause.
It is an offence to get rid of domestic waste in a way likely to cause pollution or harm to human health, including burning it.
Think about how your bonfire may affect your neighbours
If you are having a bonfire, the smoke and smell created by it can annoy your neighbours. Smoke can stop people enjoying their gardens, opening windows or hanging washing out.
If your neighbour has a bonfire and it affects you, speak to them and explain the problem. They may not be aware of the distress they are causing – and may have not thought about other ways to dispose of the waste, like composting.
Complaining to your council about bonfires
If speaking to your neighbour fails, contact your local council's environmental health department. In most cases, officers from the council will try to deal with the problem informally.
To be considered a nuisance, bonfires need to be a regular occurrence and seriously interfere with your well-being. If the bonfire is only occasional, eg a couple of times a year, it’s unlikely to be considered a nuisance in law.
If the council considers a bonfire to be a nuisance, it can issue an ‘abatement notice’. This notice may mean your neighbour must stop having bonfires completely. If they do not stick to the notice (‘comply’) they face a fine of up to £5000 and a further £500 for each day they don't comply.