Hi
Here's one more from National Archives
Home Office: Registered Papers, Supplementary HO 144/12813
Nationality and Naturalization: Krakofsky (or Kracofski), Herschl (or Harry Barnett), from Russia. Resident in London. Certificate 18890 issued 29 October 1930. from Date: 1930.
deb 
Hi,
I believe Joseph had a brother Harry so possibly the same......
Russia, Germany or Poland I find it very confusing I've browsed many internet sites, then realise when the immigration officials at the time noted so many from Warsaw, it was easier to mark Warsaw due to the communication difficulty apparently.
Thanks
Ladylil