Some Vague Thoughts about the extent to which Far Isles geography resembles British geography. Because I think it does, at least to some extent. We're doing historical re-enactment, sort of, not pure fantasy. We get our recipes from the Form of Curye, not the Lord of the Rings. But then we add food-processors, and leave out the porpoise.
So. Take a map of Britain. Look at it with your eyes half shut. Now move it back in time to 500 AD. Watch those huge oak forests cover most of it, watch the coasts change, watch the settlements spread or shrink. Now bring it up to 1603. And back to 500. Forwards…. back. Forwards…. back. See which bits are staying still as you wave it through the ages. Not a lot of them, are there? We'll keep those.
Now filter through some Peasant Ignorance. That'll blur it a bit more. Put in the bits we all know are important, miss out the rest. So Tintagel and Bradford are In, Birmingham is Out (as is most of London). I would have left out Peterborough until recently, but Strongoak just captured it, so our scouts mark it on the map. We replace all the rest with impenetrable forest labeled Here Be Dragons. (Or some other suitable beast. The map of Strongoak says "Dragons land here" in the centre, after all.)
And now for Scale. This is the fun bit! Forget kilometres. Forget miles, leagues, and anything else fixed. The distance from A to B is a number of days travel. Which will vary depending on time of year, condition of roads/rivers, chance of being accosted on the way (who, me?)
And, because this is the Far Isles, not History, things shrink and distort. It takes about two hours to get from Strongoak to Kemsing by chariot. So, that's how far apart they are. We could scale things a bit, and say "two days" instead if you like (about 30 miles?), but that still shrinks quite a lot from the Real World measurement.
So, Britain has been blurred, distorted, shrunk, had all the boring bits left out, and then shrunk some more. That's the Far Isles. This is where we start putting things back in again: because Real History is Fun!
Take High Wycombe. That has some Real History, including a tradition of weighing its leaders at May. Worth keeping, I think, even if Mike disagrees. Without looking at a road map, I personally know that it's over to the South and West, though not as far as Briavels, and will take me about two hours to reach. So, that's how much Sian knows, and that's where she'd put it on a map.
A little place called Stithenace was built up around the trade on the Great North Road, and seems to have been a bunch of Celts living in the middle of a Saxon /Viking area as late as Domesday times. That's fun! And we know it's to the North of London, because that's where the Great North Road goes. We know Camcairndryth lies to the East of the Cross at Charing Cross: and that artifact existed for most of the Society's period, so that's OK. (It didn't exist in Strongoak's main timeline, which is perhaps why we're happily spreading west: we don't know where it is!)
Of course, if you drew a line NS through the Cross on a map of Britain as drawn by a medieval peasant, it's entirely possible that the Fog of Ignorance would place Cardiff to the East of the line. So no problems there. Move any other settlements around as much as you see fit, as long as you don't cut communication lines.
By this time, any stranger looking at this map (or maps: we all have different ideas, and quite right too) would probably not recognise Britain. (If they looked at a real medieval map, they might not recognise Britain, either!). But it gives us a little bit of consistency (Briavels is West, Stormsham is East, Strongoak is North), and a source of inspiration. 1500 years of inspiration. Why throw that away?