Expansion continued in the later part of the 20th century: there was further housing built to the north of Northgate, as well as a large amount of housing expansion westwards towards Castle Hill Hospital. The development reached an effective maximum extent by the 1970s: in the decades following (up to 2010), a limited amount of extra housing stock was built, mostly infill developments within the urban limit of the 1970s. The caravan manufacturing company Swift (see Swift Leisure) moved from Hull to a factory north-east of Cottingham in 1970, the company expanded its facilities in the early 2000s, investing £6.8 million in a new factory. A new connection to the A1079 road 'Beverley Bypass' was built for the upgraded factory development. In 2015 Swift began a expansion of their factory, with a further of covered storage. In 1981, the tradition of installing Christmas lights was started by local traders, as a way of increasing trade and adding to the sense of community during the winter season. Castle Hill Hospital was extended by the addition of an oncology and hematology unit in 2009, The Queen's Centre for Oncology and Haematology, a cardiac unit and additional cancer centre for teenage patients in 2011. In 1999, the reservoirs at Keldgate were added to with the installation of a water treatment works adjacent to the west; the plant had a capacity of 90 ML/d and was supplied with water from the main four local extraction boreholes (Springhead, Keldgate, Cottingham, Dunswell). Treatment facilities included ultrafiltration, modification of plumbosolvency, disinfection and chlorination. The works were designed with an architectural style intended to mimic a local brick and pantile built building. Due to rising levels of nitrate contamination of the groundwater an ion-exchange nitrate removal plant was added in 2009 with a capacity of 33 ML/d; the plant used a rotating schedule of 20 de-nitrating reactors (14 online, 6 in stages of regeneration) with the ion exchange media regeneration phased including an initial backwash fluidisation stage, followed by countercurrent ion-exchange resin recharge. In the late 2000s, a large , 13,000 interment capacity cemetery named Priory Woods Cemetery was built on Priory Road, on the southern fringes of the village for the use of Hull City Council. The cemetery was opposed by East Riding of Yorkshire Council, and by some local residents but was allowed on an appeal, and formally opened in May 2010. In 2014, planning permission