In every memorandum of lease the following covenants shall be implied against the lessee, unless otherwise provided in that memorandum:

(a) the lessee will pay the rent reserved by the lease, at the times mentioned in the lease, and all rates and taxes which may be payable in respect of the demised property during the continuance of the lease;

(b) the lessee will keep and yield up the demised property in good and tenantable repair, damage by fire, storm, tempest, act of Her Majesty's enemies, and reasonable wear and tear excepted.