Earlier quoted context omitted.
In the UK you almost certainly have an Assured Shorthold Tenancy (even if the agent says you don't). This gives you a lot of strong rights which you can use if you know how. In practice the agent or landlord has a lot of leverage but you can often win if you use the law to your advantage. In particular there is a very specific set of steps they have to follow to evict you.
Licenses/contracts are quite popular in place of ASTs in student/shared/bed sit accommodation. Even in housing association properties, you can have a 2 year "trial" period. You only have to lightly scratch below the surface these days to find rights eroded left and right. EDIT: I said "in place of ASTs", but ASTs aren't always appropriate.
This is mainly in the context of house/flat rentals though; I realise that perhaps per-room rentals may have special cases.