The Rights of Re-entry and Forfeiture (Prescribed Sum and Period) (England) Regulations 2004
Section 167(1) of the Commonhold and Leasehold Reform Act 2002 prevents a landlord under a long lease of a dwelling from exercising a right of re-entry or forfeiture for failure by a tenant to pay an amount consisting of rent, service charges or administration charges (or a combination of them) unless the unpaid amount exceeds the prescribed sum or consists of, or includes, an amount which has been payable for more than a prescribed period.