Technical Booklet R Access to and Use of Buildings·Page 37·5.7
Wheelchair space dimensions and floor requirements
Each wheelchair space must have a horizontal floor and minimum dimensions of 900 mm wide by 1400 mm deep.
A wheelchair space should –
(a) have a horizontal floor area; and
(b) be not less than 900 mm wide by 1400 mm deep.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet R - Access to and Use of Buildings.pdf