CSLM12012 | FAQs: legislation questions and answers: where can I get a copy of the CSL legislation?
From HM Revenue & Customs · Collection of Student Loans Manual
The legislation governing the Collection of Student Loans relating to income-contingent loans is contained in The Education (Student Loans) (Repayment) Regulations 2009. This can be found online on legislation.gov.uk.
Printed copies of the legislation can be obtained from
A bookshop
The Stationery Office (TSO) Ltd (TSO Shop)