Here are some helpful links to associations, accreditations and memberships.
The Royal Institution of Chartered Surveyors
The practice is a member of the RICS, subject to its rules and regulations since 1935.
Constructionline
V&S have been vetted by and are registered with Constructionline the UK's register for qualified contractors and Consultants, since 1998.
Quality Assurance
V&S have maintained third party Quality Assurance certification since 1991 for quantity surveying and construction cost consultancy.