On arrival, United Kingdom applies Transfer of Residence (ToR1) relief under UK customs framework (jurisdiction-specific). Import VAT in United Kingdom is 20%, and relief is what keeps your household goods out of that charge. Shipments normally arrive through Southampton or Felixstowe.
This page covers what actually changes on the Singapore → United Kingdom route: what you will pay, how long the shipment is at sea, the paperwork United Kingdom customs expects from a departure in Singapore, and what to do about pets, a vehicle and somewhere to live when you land.
Departures from Singapore normally load at Port of Singapore (PSA), Changi (air freight). Singapore is a transhipment hub with daily sailings on most trades, so export bookings are quick to secure and consolidation options are excellent. Same-week surveys are common; most expatriate moves are packed within days of booking.