EIM71313 | Tax treatment of working rule agreements: site-based staff employees: qualifying conditions
From HM Revenue & Customs · Employment Income Manual
The application of the working rule agreement taxation procedures for site-based staff employees is subject to certain conditions in the following main areas:
operation of a working rule agreement on the same site (see EIM71314)
working conditions (see EIM71315)
payments of daily travel allowances (see EIM71316)
payments of lodging allowances (see EIM71317).