The admin that comes with a time of year or a move — the jobs that land all at once and are easier done early.
A twelve-month reference for the household admin that actually matters through the year - the things that land at a certain time, are easier at one point than another, or are cheaper if you do them early. UK-specific.
The full UK list - statutory bodies, money, insurance, everyday accounts - of what to update when you move, framed around the things that surface one by one in the three months after.
The practical UK checklist - passports, travel insurance, vaccinations, the car, the house - that turns the week before going away into a packing problem rather than a sprint.