Just an ordinary contract you buy at whsmith. Still legal thou and witnessed. It's a contract for room lettings as I rent out the house as a house share but 3 individual contractso as 3 tenants.
Its a Tenancy agreement -England & Wales F401
(for a furnished house or flat on a assured shorthold tenancy)
It's a shared bathroom and kitchen and the house is shared so other then their own private room the rest is shared with the other tenants. There is a downstairs toilet.
Hope this helps?