This is the school's language department, named after P.G. Mason, a former High Master, during whose tenure the building was erected. On the ground floor there are the Language Labs, two suites of listening stations, mainly used to practise the listening parts of national exams. This building was originally the school's Sixth Form block, and was built in 1966–67. The foundation stone was laid by the Queen on the occasion of her visit in 1965. By 1970 the shoddiness of the workmanship and materials used was revealed by the cracks which had already started appearing in the internal walls. It is joined to the main building on the ground floor by the Paton Library.