If you judge the country on what is written in Theodore Darlymple’s writings then I can certainly see why you would be sad. Indeed if the place was genuinely that bad I myself would have either moved out or killed myself long ago.
Fortunately it isn’t so you can cheer up. 
This ‘déclinisme’ as the french label their particular brand of pessimistic and curmudgeonly writing of this sort seems to be just an indulgence of grumpy old men who want to paint worst-case scenarios about how society isn’t just the way they want it to be and ignore anything positive. I can certainly see how it would depress one if this was the main source of information that you had about society but while this type of writing can make some relevant points, the doom and gloom is a far cry from the reality of most people’s lives.
Many (most?) of the people who have moved out of the UK in the past few years are baby boomers benefitting from the high value of sterling to cash in their overinflated houses and move to somewhere sunnier with a cheaper cost of living for their retirement.
This isn’t neccesarily a damning indictment of the UK any more than New Yorkers moving to Florida means that the empire state is a god-foresaken wasteland with a dying culture.
You can look at it as a negative phenomenon if you want to or you can look at the positive, many working class and lower middle class Brits have been able to afford a nice home in a pleasant climate to wind down in during their later years. I’m sure many pensioners would have loved the oppurtunity to do this in the 50s, 60s or 70s but it was out of the question for all but the rich back then. Does that mean that the country is a worse place than it was?
Indeed, now that house prices are plummeting and sterling is falling into the abyss, watch these trends in outward migration change. Not because people suddenly decide that they want to stay any more than they did last year but because changing economic circumstances mean that they can no longer take advantage of uniquely favourable conditions for moving elsewhere in the world that have existed over the past several years.
