Old Travel Advisory - Reserved Tickets?

An old 1998 travel advisory from the NY Times indicates that trckets to Downe House must be reserved at least 1 day in advance -

Down House is on Luxted Road, Downe, Kent. It is open through Oct. 31, Wednesday to Sunday 10 A.M. to 6 P.M. or dusk; and from Nov. 1 to Jan. 31, Wednesday to Sunday 10 A.M. to 4 P.M. Entrance is by timed tickets, which must be reserved at least a day in advance and cost $8.60, $4.30 for children. Telephone: (44-870) 603-0145.