ALM17050 | Pooled PAYE schemes: introduction
From HM Revenue & Customs · Apprenticeship Levy Manual
A pooled PAYE scheme is where multiple employers use a single PAYE scheme to report PAYE information to HMRC.
Pooled PAYE schemes are a historic practice, now only used by a small number of employers. HMRC is not currently accepting any new requests from employers to pool PAYE schemes.