DOWNHAM MARKET is popular with people who are taking early retirement – over 40 per cent of the population is aged over 60 – but families are being courted with hundreds of modern four-bedroom houses, many let to Americans from the nearby military base at Lakenheath. It is a pleasant Norfolk town with plenty of shops, good high school, a floodlit football ground, a swimming pool, and two small industrial estates on the outskirts. It used to be an inland port but today the river, contained in its high banks, is a thing to walk beside rather than a busy thoroughfare for imports and exports. This is the kind of place where you don’t have to queue in the supermarket or ever have to experience a traffic jam. A two-bedroom terraced house will cost between £110,000 and £155,000; a three-bedroom semi with a garage £140,000.