Where a residential lease is forfeited by court proceedings but the tenant later pays all outstanding sums and the landlord agrees to the lease being reinstated, what is the appropriate procedure to achieve this?

Once forfeiture has been effected by proceedings, the lease terminates and the landlord and tenant do not have any continuing liabilities under it (although they remain liable for any breaches which occurred prior to the forfeiture). The tenancy and all interests derived from it, such as sub-tenancies and mortgages, are brought to an end and the landlord is immediately entitled to possession, subject to the tenant’s right to claim relief, or indeed any other third parties who have the right to do so.

Forfeiture terminates the lease and therefore the landlord cannot choose to subsequently treat the lease as continuing (Jones v Carter).