Part 2 of these Regulations makes the right to a written statement of particulars of employment apply when an individual begins employment (a day 1 right). Currently the written statement of particulars of employment is only required to be given by the employer not later than two months after the beginning of the employment. The regulations provide that employers can decide to provide particulars in instalments providing all are provided within 2 months and the majority are provided when the individual begins employment. Part 2 also inserts additional matters particulars of which must be included in the written statement.
Link: The Employment Rights (Employment Particulars and Paid Annual Leave) (Amendment) Regulations 2018
Source: Legislation .gov.uk