In 1964 Leeds, the last provincial bastion of the rear-open platform double decker took a batch of Fleetlines to Great Yarmouth outline and the first of these was also shown at the 1964 show, Leeds continually revised this design over the next few years, in 1966 it was extended to 33 ft long rather than the previous 30 ft 10in, both decks had double curvature screens and side glazing became panoramic, with double-width window glasses. In 1968 angled flat glass at the front and a glass-fibre dash was added and a centre exit was fitted whilst the rear dome reverted to a square outline. This made the appearance similar to the Oldham Corporation variant supplied with conventional side glazing on standard wheelbase Atlanteans since 1965. The Leeds design was produced until 1975 with a few going to independent operators in England and Scotland. The Leeds and Oldham designs in turn led to the Park Royal–Roe standard design for Atlantean and Fleetline built from 1969 to 1981, which had a deeper front screen optionally to Alexander layout or flat-glazed and wider pillar spacing than the previous standard but not as long as that fitted to the Leeds style or the Manchester Corporation Mancunian. Roe built one batch of 34 Mancunians on long Fleetlines in 1972. These buses had been due to be bodied by East Lancashire Coachbuilders in 1970, but they suffered a fire destroying their works in Blackburn, so the contract was transferred to Park Royal, who in turn transferred it to Roe.