There is some discrepancy about the actual origin of the Rhodebar. I am of the personal opinion that several, if not many, people were working on developing the Rhodebar during the same time frame, not to mention people that may not have wanted to disclose the actual breeding method they used to develop their line of Rhodebar.
According to Britanic Rare Breeds:
The Rhodebar was developed by several parties at around the same period prior to 1950. It is possible existing birds in the UK originate from a Mr B. De. H. Pickard from Storrington in Sussex who used Barred Plymouth Rock, an auto-sexable American breed crossed with Rhode Island Red. Mr Pickard gained standardisation from the Poultry Club of Great Britain in October 1952.
http://www.britannicrarebreeds.co.uk/breedinfo/chicken_rhodebar.php
So for me if the Rhodebars meet the standards then they are Rhodebars regardless if they had their start from BPR or Brussbars. If however, in my opinion, the Rhodebar does not meet the standards, such as egg color, auto-sexing, etc., then they are just look-a-likes and not the real deal.
Penny