The service at The Grenadier, the dining room above a pub called The Gun in Spitalfields, was a good example of why older people, in this case two middle-aged ladies, should be tempted back to the service industries. All the Grenadier's diners were greeted with deferential warmth. 'Ah, Mr Jones, we didn't expect to see you this lunchtime, what a pleasant surprise,' one of the waitresses said, as a corpulent pinstripe bowled in.