In this Part—
"improvement" means , in relation to a dwelling house, any alteration in, or addition to, the dwelling-house and includes—
(a)any addition to, or alteration in, landlord's fixtures and fittings and any addition or alteration connected with the provision of services to the dwelling-house,
(b)the erection of a wireless or television aerial, and
(c)the carrying out of external decoration;
and shall be similarly construed in relation to any other building or land;
" improvement contribution " means an amount payable by a tenant of a flat in respect of improvements to the flat, the building in which it is situated or any other building or land, other than works carried out in discharge of any such obligations as are referred to in paragraph 16A(1) of Schedule 6 (obligations to repair, reinstate, etc. );
"long tenancy" means— and "long lease" shall be construed accordingly;
(a)a long tenancy within the meaning of part IV,
(b)a tenancy falling within paragraph 1 of Schedule 1 to the Tenants' Rights, Etc. (Scotland) Act 1980, or
(c)a tenancy falling within paragraph 1 of Schedule 2 to the Housing (Northern Ireland) Order 1983;
. . .