That depends where you measure it the widest bit (Lands End Cornwall to Margate) is about 412 miles.
One of the narrowest bits (Bowness-on-Solway to Walls End) is abot 76 miles.
From Calais,France to Dover,England, its around 26 miles.
50 miles across M27/A27.
About 4500 miles (across Canada and the North Atlantic). From Helena to London is about 4555 miles.
48 miles
123 miles
about 102 miles
210 miles
86 miles
Manchester, England is about 200 miles from London, England.
Depends from where in England, but it is approximately 3500 miles
London, England and Hereford, England are about 135 miles apart.
Kansas is about 417 miles across and 211 miles north to south.