Pancake Day's most high-profile tossers are back for the Rehab Parliamentary Pancake Race fundraiser, pitting teams of MPs, Lords and members of the press against each other.
The race is organised by the charity Rehab, which helps people with mental and physical disabilities and the vulnerable to rebuild independent lives.
This being parliament, oversight is of course necessary in the form of some strict rules: participants must flip pancakes continuously around the course as part of a relay team; 'gentlemanly and gentlewomanly behaviour will be strictly observed at all times'; 'frying pans must not be used as weapons or as a means of making unseemly gestures'; and 'any surplus eggs, flour or batter must not be propelled in the direction of other participants or spectators.'
It's free to spectate and usually thronged with photographers eager to capture the honourable members getting competitive while wearing silly hats.
Find out more here.