Some companies seem to call it "wide fronted (Victorian)" or "wide front facet", e.g.
http://www.pegasusconservatories.co.uk/conservatories/victor...http://www.diyconservatoryshop.co.uk/html/17-Wide-Fronted-Vi...http://www.spaconservatorycompany.com/conservatories/?s=pvcu...One of the 3 pictures in the rotating gallery here shows it too:
"Victorian conservatory styles comprise of the three-facet Victorian, featuring a bay front with three main windows at wide angles, and the five-facet Victorian... Both conservatories can also be made with unequal facets or what is known within the industry as 'wider front facet'. This can help minimise space lost on this design."
https://www.kjmgroup.co.uk/products/conservatories/victorianThe terms "wide front(ed)" and "wide facet" (as variations of "Victorian") crop up on quite a lot of conservatory websites, but disappointingly few give pictures. I was half-hoping to find "bevelled", which was the first word that came to mind, but no such luck, of course!