Ehhh, they live in London. In the part they live in (or have previously lived in), most houses have small gardens. We aren’t in London but have a big (ish) house & small garden in comparison. It’s Britain, we barely use it. The few weeks a year we get decent use out of it, there’s room for a small trampoline, furniture & a stretch of grass where put a slide, paddling pool & swingball etc. We decided we’d rather have more indoor space, bigger rooms, family kitchen/diner/play and bigger bedrooms each! Each to their own on that, we just aren’t very garden people!