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(a)     any person carrying on a business which includes construction operations;

(b)     any public office or department of the Crown (including any Northern Ireland[, the Welsh Assembly Government] department and any part of the Scottish Administration);

(c)     the Corporate Officer of the House of Lords, the Corporate Officer of the House of Commons[, the Scottish Parliamentary Corporate Body and the National Assembly for Wales Commission];

(d)     any local authority;

(e)     any development corporation or new town commission;

(f)     the [Homes and Communities Agency];

[(fa)     the Greater London Authority in the exercise of its functions relating to housing or regeneration or its new towns and urban development functions;]

(g)     the Secretary of State if the contract is made by him under section 89 of the Housing Associations Act 1985 (c 69);

(h)     the [Regulator of Social Housing], a housing association, a housing trust, Scottish Homes, and the Northern Ireland Housing Executive;

(i)     any NHS trust;

(j)     any HSS trust;

(k)     any such body or person, being a body or person (in addition to those falling within paragraphs (b)