Yes, but the yellow ones were not popular. Most yellow pups were put down at birth as only the blacks were wanted then. I suppose one might have been saved but unlikely. Labs were only just taking off. I think it was the Duke of Buccleuch who popularised the breed. Just had a good dig in a book I have called The Labrador Dog Its Home and History. It seems that the first dogs in (all black) came to Britain around 1928/9 and further imports around 1932-4. Britain's strict import laws due to our eradication of Rabies and needs to quarantine made imports from Newfoundland very difficult. So, there were Labs in around the end of the programmes period but only black.
Didn't know the dog in the programme was called Isis. I will store that information as it might turn up in a quiz. It's the sort of programme that 'The Leader of the Opposition' aka 'She Who Must Be Obeyed' watches while I have my nose in an improving book, from which I may make the odd observational remark. Lagopus.....