Behind an unassuming Georgian townhouse in Richmond, Millgate House hides a much-admired walled garden that tumbles down the slope towards the River Swale. It’s a small, densely planted space, thick with old roses, hostas and ferns, and considered one of the finest town gardens in the country. The house runs as a B&B, and the garden opens to visitors for a small charge. A lovely thing to fold into a day in Richmond, with its castle and cobbled market place.