The population density of Sweden is around 22/sq Km; in Powys, where I live, it's 27/sq Km - not exactly crowded. Thankfully, most of the UK population is happy to live in large towns or cities
I live in a village, that is expanding like Topsy into every wee nook and cranny of land around but even here, slap bang in the middle of the central belt, our population density is 178/sqKm. I still live surrounded by trees and woodlands though
M