[robocat]

Look into point-to-point wireless links? Find a friend outside the estate that you can work out how to get a line-of-sight to and connect up to their connection, and pay all or half of their ISP fees.

Depends on terrain for how easy it is to do.

I really like Ubiquiti products (e.g. Litebeam, Nanostation) because they are cheap, reliable, and have great features. They do need configuration, but I worked it out from Internet and YouTube when I did it.