Head to the Baltic or Balkans for a bargain Christmas Market break
Riga is cheapest of 13 European cities surveyed for a Christmas Markets break (www.postoffice.co.uk/christmasmarkets) for the third year running
Runner-up Zagreb has narrowly beaten Tallinn, where prices are down 13 per cent
Lille is best value in Western Europe, thanks to a 17 per cent year-on-year price fall
Post Office research found that two-night breaks cost less this year in seven o