ANYONE using creosote now (apart from some industrial uses) is breaking the law and should be reported. In June 2003 the EU banned it, see below from government site, just because it's still sitting in someone's shed doesn't mean you can use it, you have to take it to the council refuse yard for safe disposal. Your horse's health is at risk IF creosote is being used as Kturner has found out!
Creosote ban
Since 30 June 2003, creosote has been withdrawn from sale to householders. Stored creosote must not be used by householders and should have been disposed of safely and responsibly by 31 June 2004. The change in law is due to its recently found cancerous properties.
Creosote use
Creosote treated timber may not be newly used inside buildings, toys, playgrounds, garden furniture, packaging of human and animal consumables (including growing containers), or in any item which may receive frequent skin contact.
Provided there is no risk of frequent skin contact it is acceptable to keep already treated wood in the garden.
Creosote disposal
Residents should take their unused creosote to local recycling centre and tip and inform the operator so it may be disposed of in their hazardous chemical store.
Retailers should contact the Environment Agency for disposal of their stock.
External links
Revocation of approvals for amateur creosote/coal tar creosote wood preservatives
The Creosote (Prohibition on Use and Marketing) (No. 2) Regulations 2003 (SI 2003 1511)