http://www.allagents.co.uk/rss/Guardian Estates & Lettings Ltd Guardian Estates & Lettings Ltd is an Independent Estate & Lettings Agency based in Walthamstow, East London. Situated in the heart of Walthamstow and have been established since 1996 trading under the name of Bel Air Estates, currently trading under the new name Guardian Estates & Lettings Ltd.