QBD 11 May 1990. M occupied a property on assignment to him of an earlier lease, which he surrendered when taking a new lease which ran from 7 September 1977 to 24 June 1981. It is the nature of his holding over after that date which is what has to be determined. The appropriate day is 23 March 1965, when rateable value above £400 excluded properties from the Rent Acts . As from 22 March 1973 that figure became £600 and from 1 April 1973 £1,500. If the rateable value exceeded those sums on the respective dates M is not protected. On the valuation list of 1 April 1963 the property was valued at £680 and remained at that until the revaluation of 1973 when it was set at £1,763. M made a proposal to reduce rateable value. A surveyor gave evidence that both the 1963 and 1973 valuations were flawed by a surveying error . VO agreed reductions, with £680 being reduced to £576 and £1,763 to £1,347, and pursuant to the General Rate Act 1967 s79 the reductions took effect from the start of the