Both All Purpose Flour or Bread Flour (or a combination) should work in a crumpet recipe! All Purpose Flour alone would likely give you a softer texture, while Bread Flour may give the crumpets a bit more of a chewy texture, but both should work in this sort of recipe. We hope you love any of the flours you try!
Crumpet recipes vary a lot in water/milk and about "strong" bread flour, AP flour, or a mix of both. Even though they seem like ring-contained pancakes, in contrast to baking soda in pancakes, they do all agree on raising with active yeast. (Though they again differ on what they call that.)
Would all purpose "regular" flour work well as its name implies, or would it let them fall flat?
Would bread flour (which I would have to purchase just for this) be better, or would they be "chewy"?