rear-entrance exposed-radiator Titan PD3 in 1958, and Western SMT took lowbridge rear-entrance tin-front PD3s in 1960 these were the last double-deck motorbus bodies built in Blackpool. The single-deck bus body styles began to diverge from the mid fifties with some operators such as Sheffield Transport looking for more coach-like vehicles while Reading sought a design better suited to moving large numbers of standing passengers. Before the end of Burlingham's independence, there was an important development with trolleybuses, as Glasgow Corporation ordered a batch of ten single-deck 50-seaters on BUT RETB1 chassis. These were Burlingham's only electrically powered single-deckers and the longest single-deckers yet seen in Britain. Diminishing returns Burlingham sought to facelift the Seagull every two years or so to keep up with rival coach builders but every time a change was introduced some of the original purity of line went with it. Whilst late Seagulls on Reliance or Tiger Cub chassis could still look good, the Seagull Mk 7 was launched at the 1958 motor show but only 20 were built on underfloor heavyweight chassis, the versions for Bedford SB, Commer Avenger or Ford Thames Trader PSVs began to assume a very strange appearance, the strangest perhaps being the version known internally as 'The Pig' which was fitted with a shallow two-piece wrap-around windscreen. Launched in 1958, it was at the limits of glazing technology, yet less than a year later Plaxton and Duple had designs with deeper and better looking windscreens supplied by the same company. Burlingham realised there was nowhere left to take the style, which by now had reverted to steel reinforced timber frames for the lightweights and from 1959 launched a new range of bodies. These were the Seagull 60 for front-engined lightweights and the Seagull 70 for underfloor-engined chassis. By August 1960, Duple Motor Bodies Limited had acquired 100% of the share capital of H. V. Burlingham Ltd at a price of £550,000. Afterlife Although H. V. Burlingham was renamed Duple (Northern), existing body designs continued to be sold under the Burlingham name, these included more Reliance standee buses for Reading, a final batch of double-deck trolleybuses on Sunbeam F4A to a forward entrance design, also for Reading and two restyles of the body for lightweight coaches, the Seagull 61 and the Gannett. After that, some further Blackpool designs were introduced, primarily the Continental, Alpine Continental and the Firefly/Dragonfly, but these were badged as