Hillingdon Narrowboats Association are a charity who own and operate five narrowboats and are based at Coppermill Lock, Harefield, London on the Grand Union canal. Their boats can accommodate from 8-12 passengers and can be booked for day trips or residential. They can provide a skipper or there is training available for people who want to take their own groups away. They hire their boats out to school, community and voluntary groups. Private and corporate hire is also available.