Block Management in Wilton

Ten Environment Agency areas overlap the built-up area, and both rivers and groundwater produce warning areas that name Wilton's streets. On groundwater, the Salisbury Plain alert covers 78.0 per cent of the town and the Cranborne Chase alert a further 21.9 per cent. Above those sits a warning area whose published description is simply groundwater flooding for Wilton, covering 10.7 per cent. On rivers, the Lower Wylye at Wilton Town warning area covers 8.3 per cent and names Grovely Riding School, Ditchampton, North Street, Castle Lane and Minster Street. A separate warning area for the River Nadder at South Street covers 1.2 per cent. It names South Street between Bull Bridge and the Library, including the surgery, the Michael Herbert Hall and its car park and the allotment gardens. The Environment Agency runs separate catchment alerts and separate in-town warning areas for the Wylye and the Nadder. Roughly a ninth of the built-up area is in Flood Zone 3 and a sixth in Flood Zone 2. The gauge in the town, on the Nadder, has a normal range of 0.09 to 0.57 metres. It publishes 0.76 metres as the level above which property flooding is possible, and recorded its highest ever level of 1.19 metres on 27 January 2026. The Environment Agency proposed a defence scheme in March 2017 to protect the 30 properties then at high risk. It comprised a raised embankment about half a metre high around the recreation ground, joining the existing defences beside Wiley Terrace, plus a flood wall to protect properties in Crow Lane. Construction was intended to start in early 2018 and finish that summer. No cost was published and no source confirms it was built. What is confirmed is that the town's defences are demountable and depend on people. The town council records that the barriers are deployed when flooding is imminent, on Environment Agency advice, by volunteer flood wardens who manage installation and removal, under a flood plan dated February 2023. For a block, insurance, the reserve fund and the emergency plan should rest on those confirmed defences only.

Applications are decided under the Wiltshire Core Strategy, adopted 20 January 2015. Its Core Policy 33 makes Wilton a local service centre and provides for approximately 255 new homes across the community area to 2026. The largest single allocation affecting the town sits in a different policy. The former army headquarters site is allocated under the Salisbury community area policy as UKLF, Wilton, for 450 dwellings, of which 40 per cent are to be affordable. It also includes three hectares of employment land intended to provide at least 1,200 jobs to replace those lost when the military site closed. The term Erskine Barracks appears nowhere in the adopted plan. The development template for that site identifies the setting of Wilton Park and the conservation area, the risk of coalescence with Salisbury and proximity to the River Nadder among its constraints. The emerging Wiltshire Local Plan reached examination in November 2024 but was withdrawn on 22 May 2026 under section 22 of the Planning and Compulsory Purchase Act 2004. Its replacement is not expected before 30 April 2029. The council states that the 2015 Core Strategy's policies are not automatically out of date and will continue to guide development. There is no neighbourhood plan and no Article 4 direction. About 13.5 per cent of the parish lies inside the Cranborne Chase National Landscape. Only half a per cent of the built-up area does, in a sliver at the extreme western tip more than a kilometre from the market hall, and none of the conservation area. The constraint that applies everywhere here is nutrient neutrality. The whole town sits inside the River Avon Special Area of Conservation catchment, where the applicable nutrient is phosphorus. The adopted housing site allocations plan records that new development within the catchment must be phosphate neutral. The river itself runs through the town, covering about one per cent of the built-up area. For a block, phosphate neutrality matters if a project would add dwellings, such as a conversion or an extra flat.