a) Period/length of the tenancy
A Lease is generally legally referred to a document that creates a fixed term tenancy for more than 3 years. It has to be executed in the form of a deed, meaning that it has to be signed, sealed and delivered by the parties. That is to say, the parties have to sign the Lease, affix a red seal (a small red wafer) next to their signatures and exchange copies of the lease. It is desirable for a Lease to become registered in the Lands Registry.
A Tenancy Agreement is generally be referred to a tenancy for a period not exceeding 3 years. A tenancy agreement may be signed or agreed verbally between the parties .
For tenancy agreements which are put into writing, the parties to a Tenancy Agreement only have to sign it, without needing to affix the red seal and exchanging the document. To protect the interests of both parties, however, it is recommended that the parties should exchange and keep copies of the Tenancy Agreement as signed.