1 Hotel Mayfair: a gloriously luxe family-friendly staycation for half-term

At the height of one of the many summer heatwaves, my husband, daughter and I left the sweaty crowds at Green Park station behind, slipped into a side street off Piccadilly and strolled through the greenery-decked entrance of 1 Hotel Mayfair into a blissfully air-conditioned lobby. We were 40 minutes from home but it felt like we were four hours away: who needs a flight when you can take the Jubilee line?