Hello Debbie, and welcome.
I have played flugel in a Norwegian "British style brass band" for 25+ years. During these years, I have used B&H Sovereign (medallion), Getzen Eterna 4-valve, Besson Sovereign 947, and currently I use the Conn Vintage1. All these horns have been usable in my band, but this has something to do with your own style of playing to blend with the other instrument groups, Eb-horns/trombones and cornets, not always the brand of the horn. My mouthpieces has always been Denis Wick, 4F, 4FRW and currently I use 4BFL, which suits me and my horn superb. In BBB, there has been som "legal" flugel brands, as Bach, Cortouis, Yamaha. When I first brought the CV1 to rehearsal, a lot of high eyebrowes and downwards smiles met me, but the horn blended in without any problems. A flugel is a flugel and not a Eb-horn, trombone or cornet, and should sound like - a flugelhorn. Nothing else! The CV1 is built like a "french" vintage horn, which means small bore. This give me the opportunity to play softer with the Eb- horns and trombones, and brighter with the cornets. This is the reason that these groups always sounds better when the flugel joins the party
. So, try different brands and mouthpieces before you decide which horn you are going to buy. Don't hang up into old conservative British Brass Band ideas, but do your own choice. I did so, and I am glad I did!