I believe that Oreti has this same dahlia in her garden. It is a lovely thing and just keeps blooming.
Thank you @Sjoerd , I do indeed,....mine are from the Happy Single series. Shocked I know that I actually know this , it's because they are cuttings taken from one my Mum had in their garden . I always loved the contrast of the yellow and bronze leaves so after my parents passed away and before selling their property I took several cuttings. I was quite upset this year when I noticed they too had succumbed to Powdery Mildew..due to the exceptionally dry summer we had. They are now all looking good I'm pleased to say. https://www.jparkers.co.uk/dahlia-happy-single-collection/