Unless you’re actually sitting on the Scottish border (not recommended; sometimes cold), you couldn’t get much closer to Scotland than this. In fact, *dons history hat*, Berwick-upon-Tweed, the most northerly town in England, was originally part of Scotland and was scrapped over so much by the English and Scots that its enormous walls were built to keep northern invaders out. Tsk.
None of which, of course, should be your concern if booking a Berwick-upon-Tweed campsite – apart from the fact that you can roam the Scottish Borders from here too. We do love our walled cities (see also York, Chester and Brittany’s St Malo), so start off with a 45-minute stomp around the ramparts for views of the Tweed estuary and Robert Stevenson’s Royal Border Bridge – and also, perhaps, pretending to be a medieval archer? (We will not be judged.)
Berwick Barracks, the oldest in Britain, is another stellar spot for military imaginings, then take yourself waterwards: 30 miles of Northumberland beaches are all day trip-doable from Berwick, and there are stacks of opps for sea fishing or nearby salmon fishing on the River Tweed.