Bill D ~ most authorities like Fowler accept that a collective noun can correctly take a singular or a plural verb: 'The team play well together' or 'The team plays well together' ~~ both acceptable locutions. So don't worry too much about Man U's singularity or plurality in this context; but worry more about the absurdity of the association made in the fatuous statistic.
Jim ~ I have always heard 30% as the figure re heat lost thru head. Whatever the actual quantity, tho, I do find a hat a comfort in cold weather.