Profile 22, Spectus, Synseal to name three more profile manufacturers, and I think Anglian do produce their own profile although their consevatories are rebranded Ultraframe (as are Everest ones). The profiles are fairly similar though, all basically a chambered box section. The glass is more important, ask the salesman about the U value, lower is better, rather than swallowing the energy rating. We’re in the same boat, had three quotes so far, traditional chain, stupid price, irrirating salesman, very unprofessional, local firm much better initial price, knew his stuff and professional and a bunch of local guys personally recommended, still waiting for their quote. The last lot weren’t very slick but did survey the house well for the quote. My preference at the moment is the middle one, established business with showroom, not taking the wee wee.