A visit to the dentist is the only time I ever take Valium. But I was straight on the morning I pitched up at Dawood & Tanner, an absurdly hi-tech practice in a Wimpole Street house that feels completely un-medical and un-municipal: Timorous Beasties wallpaper, cool 1950s chairs, original ceiling friezes, two operating theatres, on-site orthodontists, dental technicians so skilled as model-makers and so aesthetically aware that they mould for Ron Arad and some of Britain’s most famous artists — the names are all kept very schtum. And it doesn’t feel like a dentist’s, so I wasn’t frightened. And the hygienists gave me the pearliest gnashers in half an hour.