Price v Strange - P sub-tenant of S lessee, after expiry of the sub tenancy, P postponed and continued paying rent, S orally agreed to grant a long underlease at increased rent in return for P making repairs to the premises, both parties accepted. S rejected oral agreement and had repairs done herself, whilst collecting the extra rent for 4 months. P claimed SP, dismissed due to want of mutuality, P appealed and it was allowed, ordering SP