Thanks again for the replies.
Yes, travelling minstrel shows were very popular in Britain before WW1, especially at seaside resorts.
Debussy and Emma Bardac stayed at the Grand Hotel in Eastbourne in the summer of 1905, and he is said to have put the finishing touches to 'La Mer' while at that hotel. They also visited Jersey at about the same time. They would certainly have seen minstrel shows on the seafront in both places.
Someone has told me that he got the idea for 'Minstrels' from a travelling band (perhaps 'band' in the sense of a troop of performers?) that he had seen in England. Thanks to information received on this forum, I now know that the piece was written later than 1905, but it's possible that an idea could have stayed with him. I would dearly love to find evidence from a biography or other work. I will go to our local library this week but the music section may not be well stocked.
The following websites have information:-
https://www.debussy.fr/ (and)
https://www.litart.co.uk/The second has an account of his visit to England; the detective work relating to the Blüthner which he first rented, and then took back to France, is superb.
Anyway, I hope that someone on this forum will have a book which may help with regard to his inspiration for 'Minstrels'.
Comments greatly appreciated ...
M