More likely to see Burkas in Mayfair (Gulf Arabs) than Whitechapel (British Bengalis).
Funny you should say that, I was taking my son up to Whitechapel/ Stepney yesterday to move into a house and whilst unpacking the car, a lady walked by in the most extreme burka I have ever seen. Don't know how she could even see as it didn't seem to have anywhere for her eyes to look out from.