Running holiday lets in Pembrokeshire, where a cottage that misses 182 nights pays the second-home premium

The two rules work together. A cottage let for 181 nights stays on council tax, and in Pembrokeshire that bill comes with the 125% premium. For a let on the edge, every booking in the shoulder season decides which way it goes.

Read this as a guide to the public sources, not as advice for your own cottage. Upbridge doesn't register lets, deal with the council's tax office or file anything for owners.

The Pembrokeshire Coast Path runs 186 miles from Amroth to St Dogmaels, with about 35,000 feet of climbing and descending along the way. Walkers can use the coastal buses, among them the Puffin Shuttle, the Coastal Cruiser, the Celtic Coaster, the Strumble Shuttle and the Poppit Rocket.

A walker who stays a night or two and moves on leaves wet boots and muddy kit behind. Short stays mean more changeovers, and every extra let night also counts towards the 182.

Upbridge takes your bookings from Uplisting, Hostaway, Guesty or Lodgify, or from an iCal link, and gives each checkout its own cleaning with photos of every room. Because every let night is in one calendar, you can see during the year how close each cottage is to 182.

The guest guide tells a walker which coastal bus stops near the cottage and where to leave boots. After each stay, inventory per property lowers the count of towels, logs and soap, and a bank holiday no longer catches you short.

The coast is long and the lanes are slow. Seeing all owners' changeovers at once in a cleaning-company account lets you work around St Davids one day and Tenby the next, and each owner is still your client.