Alma Cottage is a a tea-room and guest-house in Pin Mill run by Miss Powell where the Walkers stay, in (WD1,14) and (SW1).
Miss Powell is a real person, and was born in Alma Cottage when it was the Alma Inn. She learnt to make omlettes after young AR fans wanted omelettes like the mushroom omelettes following pea soup that Jim Brading and his uncle used to ask for (WD2). She left it in 1955. (Wardale page 117)