As always it's been a pleasurable read.
If Tonkotsu is your thing then I definitely recommend you to make a visit to Bone Daddies (although I find their soy ramen better) and Kanada-Ya. I personally find them both more competitive in price and taste. Especially Kanada-Ya - I'd rate it as the best ramen place in London.
As a part of a series, I'm actually thinking of writing an article about different ramen places in London - would you be interested to read it by any chance?
RE: The Authentic Tonkotsu Ramen in London / 正宗的日本豚骨拉面