Does the UK Have a "Grandfather Clause"? Not Generally, But Some Specific Laws Do

The UK lacks a general statutory grandfather clause (a blanket exemption for pre-existing situations when new laws pass). Instead:

• Transitional provisions are written ad hoc into each Act (e.g., "this Part does not apply to contracts made before [date]").
• Common law protects vested rights and legitimate expectations against retrospective legislation.
• Specific examples: Equality Act 2010 (religious organisations exempt from certain service provisions); Planning Acts (existing use rights).

So while the mechanism exists, it’s not a single overarching "grandfather clause" as in U.S. constitutional law.