I always find it really weird when somebody on the anonymous internet talks about local places as if we're all neighbors or something. Googling "Richmond Hill" gave me multiple pages of results that had nothing to do with the one that Attenborough lives at.
I really enjoyed OP's story, and the way they told it. Knowing the location of Richmond Hill is really not the point.
If you're familiar with London, you know where Richmond is and that it's a wealthy area. A search confirms there's a Richmond Hill in Richmond.
Richmond Hill, London
Not to sound hipster about it, but if it's done in this way I find it charming. I also had to piece it together, which took me on a little virtual travel tour, and had me wonder about what Richmond Hill means to the locals. Rather fitting in context, too.
The "everyone on the internet is American" stuff in e.g. politics or job market convos is a lot more grating.