The Hub
Our housing guidance site
Introductory tenancies were introduced by Part 5 of the Housing Act 1996. In Camden all new tenancies from 7 April 2008 have been introductory tenancies.
The guidance is quite prescriptive as there are various timeframes for taking certain kinds of legal action.
You can read the full guidance here
An introductory tenancy (sometimes called a probationary tenancy) is for a trial period of one year before a tenancy becomes secure. The trial period can be extended to 18 months if the Council has good reason such as breaches of the tenancy conditions that either have occurred or are likely to occur.