resignation “with immediate effect” takes immediate effect

Horwood v Lincoln County Council is a useful reminder that although the parties to a contract can, between them, agree to change the end date of a contract, bringing it forward and or putting it back, that cannot displace the effective date of termination as defined in the Employment Rights Act 1996 s. 97, which is crucial for calculating time limits for bringing employment claims.
Ms Horwood wrote a letter of resignation to her employer in response to what she said were defects in a disciplinary process applied to her and her subsequent demotion, claiming that these amounted to constructive dismissal. Her letter stated that she wished her resignation to have "immediate effect".