<Li> Land's End is the extreme southwestward (but not southern or western) point of Great Britain, situated in western Cornwall at the end of the Penwith peninsula, O.S. Grid Reference SW342250, Post Code TR19 7AA . The most southerly point is Lizard Point . </Li> <Li> John o' Groats is the traditionally acknowledged extreme northern point of mainland Scotland, in northeastern Caithness, O.S. Grid Reference ND380735, Post Code KW1 4YR . The actual northernmost point is at nearby Dunnet Head . The point that is actually farthest by road from Land's End is Duncansby Head, about 2 miles (3 km) from John o' Groats . </Li> <P> The straight - line distance from Land's End to John o' Groats is 603 miles (970 km) as determined from O.S. Grid References, but such a route passes over a series of stretches of water in the Irish Sea . Google Earth reports a distance of 602.70 miles between the two iconic marker points . </P> <P> According to a 1964 road atlas, the shortest route using classified roads was 847 miles (1,363 km) but in a 2008 road atlas, the shortest route using classified roads was 838 miles (1,349 km). An online route planner in 2011 also calculated the quickest route by road as 838 miles (1,349 km), estimating a time of 15 hours 48 minutes for the journey (this uses the A30, M5, M6, A74 (M), M74, M73, M80, M9, A9 & A99) but the overall shortest route by road, using minor roads in numerous places and utilising modern bridges, is only about 814 miles (1,310 km). This route is roughly as follows: Land's End, Bodmin, Okehampton, Tiverton, Taunton, Bridgwater, the M5 Avon Bridge, the M48 Severn Bridge, Monmouth, Hereford, Shrewsbury, Tarporley, St Helens, Preston, Carlisle, Beattock, Carstairs, Whitburn, Falkirk, Stirling, Crieff, Kenmore, Dalchalloch, A9, Inverness, Kessock Bridge, Cromarty Bridge, Dornoch Firth Bridge, Latheron, Wick, John o' Groats . </P>

How many miles from lands end to john o groats
find me the text answering this question