How about trying a range of English/Balkan blends? Have a head to head of say, Arango Balkan Supreme and Sutliff Match BS 759 and see which one they like better. Then have a head to head with something like GLP Quiet Nights vs Peterson EMP. Ask what they do and don't like about each. Just pick stuff that is sort of opposing in the spectrum first.
Some will have more prominence in a taste of leather, or smoke, or sweet, or incense, etc. Some will be lighter, some heavier, some smoother, some more savory, more spicy, etc. But it can help you narrow down the kind of English they're likely to enjoy by looking for key words in reviews, as well as ingredients.
You can also basically skip any review that says "poor man's Penzance" to help narrow down better reviews of English blends, since every single English, no matter how it tastes, is going to have at least 2 people that says it's a "poor man's Penzance"—it's almost like it's a requirement for something to be an English blend.
That's really the only way, there's no archetype or standard for English. What defines a VA blend is the VA taste; what defines an English blend is the mix of Lat and VA and Oriental tastes. That's part of why there's no archetype—because the pinpoint isn't a particular tobacco being prominent, but the mix itself of different tobaccos. For example, here's some ingredients of different English blends showing variance...
• SPC Plum Pudding Special Reserve:
Black Cavendish, Latakia, Oriental/Turkish, Perique, Virginia.
• Sutliff Crumble Kake English #1:
Burley, Latakia, Oriental/Turkish, Virginia.
• Sutliff Match BS 759:
Kentucky, Latakia, Oriental/Turkish, Virginia.
• Peterson EMP:
Latakia, Oriental/Turkish, Virginia.
Also note, oriental alone is a broad category so several different leaves with various flavors (Macedonian/Katerini doesn't taste like Izmir or Samsun for example), which they choose can have different effects.