Did you go anywhere outside London? I don't think there's anything wrong with the frequency in this part of the UK for example (see pic below).
When I'm out walking I always seem to meet friendly people – if I'm not already accompanied by them! There's loads to do even in the foulest weather if you're into indoor climbing for example. Or music. Or... I could name a hundred other low-cost social activities.
Certainly speaking personally the only time I've ever felt lonely in the UK is when I worked in London, as I couldn't afford to go out and meet people and getting out of town was a major hassle - although even then I joined a cycling group, which helped me get out of town occasionally and helped me meet people.