single centre walking holiday UK

[faffadoodledo]

Can anyone recommend just that? A single centre walking holiday in the UK (southern England to be more precise). We'd probably only want three nights, with two full days walking (capable of up to 20 miles a day). Trouble is our map reading is a bit ropey so something without micronavigation would be ideal!
It's for me and a friend.. one coming from cornwall, the other rom London and meeting somewhere midway (but doesn't have to be precisely midway!).

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Did you find anywhere in the end @faffadoodledo?

You could do Brecon Beacons (Bannau Brycheiniog) - Brecon, Abergavenny or even Llanthony are good bases. You would need to keep your wits about you navigation-wise.
Cotswolds Way is reasonably well signposted and there are nice places to stay nearby, but you would need to plan circular walks (walk the Way in one direction and circumnavigate another route back, or use the bus).
Exmoor and the Quantocks both lovely, and can be combined with the south-west coast path which is the easiest navigation of all! Again though, if you don't want there-and-back walks you would need to navigate an inland route back but Exmmor is reasonably well walked hence should be doable with an OS map, or there is a coastal bus.