If you head northeast from the Gog Magog hills you will stay over land. The longest you can go in that direction without exceeding 75m elevation is I think abou

If you head northeast from the Gog Magog hills you will stay over land. The longest you can go in that direction without exceeding 75m elevation is I think about 200km, going just to the east of Peterborough and Lincoln, over the Humber to a liitle place north of Market Weighton called Londesborough, roughly halfway between York and Hull. East of Lincoln there's a long valley that's very nicely aligned so that our line can slip between the Lincoln Edge and the Lincolnshire wolds.