5Where a relevant notice of claim is given, any notice terminating the lease of any flat held by a participating tenant, whether it is—
(a)a notice given by the tenant, or
(b)a landlord’s notice given under section 4 of the [1954 c. 56.] Landlord and Tenant Act 1954 or served under paragraph 4(1) of Schedule 10 to the [1989 c. 42.] Local Government and Housing Act 1989,
shall be of no effect if it is given or served during the currency of the claim.