The European Parliamentary Elections (Amendment) Regulations 2018

These Regulations amend the European Parliamentary Elections Regulations 2004 (S.I. 2004/293) (“the Principal Regulations”) to alter the provision for filling a vacancy arising mid-term in the seat of a member of the European Parliament in an electoral region in England, Wales, Scotland and Gibraltar.

Link: The European Parliamentary Elections (Amendment) Regulations 2018
Source: Legislation .gov.uk