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Brennell Mk. 5, 1963
From the Brennell Website:

In 1963 a new Series 3 deck appeared. This was re-engineered to accomodate Papst spool motors with rim brakes, heavier flywheel and improved Bogen Universal heads setting new professional standards in wow and flutter and frequency response. These decks are immediately recogniseable by their large black plastic spool turntables and, on cabinet fitted models, by two large chromed thumb screws which could now allow the deck to be raised on its rear hinges without having to remove the masking plate and knobs!

Brenell had already started to produce a whole series of special purpose decks based on the Mk.5, including a specially modified replay deck for use by patients in hospital, fitted with an extra long and easier to operate play control lever (the photo (below left) shows it incorrectly fitted). This allowed them to listen to "spoken books" from the Hospital Library Service. These machines used a non-standard tape width and a unique playback speed to prevent unauthorised home recording! There was even an experimental two-way recording deck as well as many data recording and tape-loop echo-production decks. However the most significant model appeared in 1963 - the astonishingly versatile (and mind boggingly complex!) Brenell STB1, above.