Gentworks supplies a range of Doc-M (Building Regulations Approved Document M 2015 edition) disabled washroom products from Armitage Shanks, Nymas and Phlexicare. The building regulations regarding Doc-M can be confusing. It may be incorrect to assume that buying a pack labelled as "Doc-M" actually fufills all the appropriate conditions. Note that new washrooms are typically expected to include all the items in a fully compliant pack whilst refurbished washrooms may only require the more basic items.
Below are links to view the Doc-M regulations (section 5 starting on page 56 is of particular interest), plus images and diagrams of layouts that provide guidance. (NB: You may need to instruct your browsing software to allow these 'pop-up' PDF files to load.)