A bright, airy dining space with a rustic wooden table, antique spindle chairs, and a large glass lantern pendant light hanging from a vaulted white ceiling. In many ways, this double-fronted townhouse in west London has a very classical look, but behind its handsome facade lies a rather special addition. When interior designers Pamela and Kate Cox first visited their clients’ new home, they were surprised to discover a studio building in the rear garden.