Like many other successful landlords you are probably using this site to save yourself the cost of letting agents and solicitors.
The documents and links listed below should provide you and your tenants with some peace of mind and keep all parties within the law.
Assured shorthold tenancy agreement (as defined in the Housing Act 1988)
Download (and modify as required)
Landlord and tenant obligations
Link
Houses in multiple occupation
Link
Tenancy Deposit Scheme (new from April 2007)
Link
Residential Landlord's Association (RLA)
Link
Gas safety
Link
Finding a competent electrical installer
Link