Six top destinations:

Sydney: £474
Austrian Airlines from Heathrow or Manchester via Vienna. Must be booked by January 16. Full payment required when booking. Valid for departures until April 8, then April 23 - June 30. Minimum stay one Saturday night, maximum one month. All travel must be completed by June 30. Airline Network (0800 747000).

Amsterdam: £79
British Airways from Heathrow. Must be booked by January 29. Valid for departures until April 5. Minimum stay one Saturday night, maximum one month. Trailfinders (020-7937 1234).

New York: £177
Virgin Atlantic from Heathrow. Must be booked by Jan 29. Valid for departures until Feb 28. Minimum stay one Saturday night, maximum one month. Going Places Direct (0161-908 7967).

Hong Kong: £373
KLM from Heathrow, London City, Stansted, Aberdeen, Birmingham, Manchester, Bristol, Cardiff, Edinburgh, Glasgow, Humberside, Leeds/Bradford, Teesside, Newcastle or Norwich via Amsterdam. Must be booked by Jan 31. Valid for departures until April 5, then April 23 - June 15. Minimum stay seven days, maximum one month. Quest Travel (0870 4430746).

Los Angeles: £231
British Airways from Heathrow. Must be booked by January 29. Valid for departures until February 28. Minimum stay one Saturday night, maximum one month. Thomas Cook Flights Direct (0870 7520066).

Paris: £106
British Airways from Birmingham. Must be bought at least three days before departure. Valid for departures until Dec 31. Minimum stay one Saturday night, maximum one month. Trailfinders (0121-236 1234).

The pick of the rest:

Perth: £499
Royal Brunei from Heathrow via Brunei. Must be booked by February 27. Valid for departures from January 16 to March 31. No minimum stay. All travel must be completed by May 30. Thomas Cook Flights Direct (0870 7520066).

Antigua: £359
Virgin Atlantic from Gatwick. Valid for departures until April 5. Minimum stay one Saturday night, maximum three months. Trailfinders (020-7937 5400).

And the rail alternative:

Paris/Brussels: £50 (Lille £45)
Same-day return. Must be bought at least one day before travel. Valid for departures on Saturdays and Sundays until Feb 11. Eurostar (08705 186186).

NB Fares can change rapidly. These were available in reasonable quantities at the time of writing, but they can sell out in a sudden rush.