(Multi-part post):
I live in Suffolk and I know Aldeburgh well.
Aldeburgh used to be a pleasant, sleepy little fishing town which was hardly known by anyone outside of Suffolk. That was up until 1948 (which is even before my time!). It was then that Benjamin Britten founded the Aldeburgh Festival, which has seen the continuous rise of Aldeburgh's 'up-market' status. (Some, including myself, would replace 'up-market' by 'pretentious' or 'snobbish' but I know others who would disagree).
These days, much of the population of Aldeburgh is seasonal. A few years ago, of all the many properties in a row facing the sea, only two were lived in all year round. The rest were holiday homes, mainly for rich Londoners. (I doubt that the position will have changed much now except that, by now, all of those properties might be holiday homes).
Of those people who live in Aldeburgh all year round, very few find employment in the immediate area. There are lots of people who commute to Martlesham (to work at the massive BT research centre), to Ipswich (to work in the many insurance firms based there) or to London (to work in the City). This means that Aldeburgh has plenty of wealthy City bankers living alongside relatively poor local people. (Suffolk is one of the lowest paid counties in the country).