When we had the peace dividend in 1990/91 in the run up to GW1 it saved a fortune in heating and lighting. Same as happened in the 46/47 winter when units were closed for weeks.
I would go with the Sunday Times. Another way to save money would be to abolish chinagraphs in March.
Perhaps one of the biggest saving in a long stand down is the frequently nugatory runway de-icing etc.