According to AA routeplanner it is approx. 308 miles. However it is dependant on exactly where you begin and where you end, as this could make a difference of several miles.
London/Penzance 255 miles
The distance between Exeter and Penzance in Cornwall, England is approximately 130 miles by road.
Manchester, England is about 200 miles from London, England.
London, England and Hereford, England are about 135 miles apart.
Penzance to Gretna is 461miles. Hope that helps you a bit. Jak.
about 102 miles
175 miles
From Landewednak/Penzance area to River Tweed at Berwick (Scotland/border) is 471 miles or 7 driving hours 57 minutes.
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126 miles
5,130 miles
Maine is roughly 3150 miles from London, England.