For the avoidance of doubt it is hereby declared that the provisions of this Act, and any restrictions or powers thereby imposed or conferred in relation to land, apply and may be exercised in relation to any land notwithstanding that provision is made by any enactment in force at the passing of the Act of 1947, or by any local Act passed at any time during the Session of Parliament held during the regnal years 10 & 11 Geo. 6, for authorising or regulating any development of the land.