You would drop by Grenson on Lamb´s Conduit Street.
They got a sale on on their Made in England G one line (uppers from Tanneries du Puy, oak bark -tanned soles fron J & JF baker) their G fitting last are generous, while keeping a good grip on the heel, and far more comfortable than Tricker's 4444, and 4497.
After, cross the street to Noble Rot for a glass Pinot or Poulsard
I have tried Grenson couple of times before. But sorry. Didn't get them to fit my feet.
But I like pinot, and also like the wine bare: Noble Rot