"According to an index that tracks seasonal food, the price of Christmas dinner is now at its lowest since it started in 2009."
http://www.bbc.co.uk/news/business-38145439
For a Christmas Dinner that cost £37 a head last year, the cost in 1975 would have been nearly £55
http://www.bbc.co.uk/news/business-38145439
For a Christmas Dinner that cost £37 a head last year, the cost in 1975 would have been nearly £55