I'm wondering about the prominence of Sri Lankan Tamils among British people.
I tend to identify as generalised (racial?) Indian personally and I feel like I've "Indianised" as part of growing up in the UK. Most of my extended family and Sri Lankan friends (Tamil and Sinahlese) also do something similar, so you may not even know that someone around you is actually Sri Lankan Tamil unless you're friends with them or close to them.
Population figures seem to have as at a maximum of 200,000 in the UK, with declining birth rates (i.e. two parents have only one child being normal). We're spread out into towns and cities with the highest concentration of Sri Lankan Tamils being found in the London area of Kingston-Upon-Thames which is roughly 6% Sri Lankan Tamil, though personally I don't associate the area with Tamils as it's mainly Korean/Japanese and I tend to think of Harrow as being the "centre" of Sri Lankan Tamils because the latter has so many Indians and the culture is practically the same.