is it an all grain recipe your after? I made a heather ale extract beer a few years ago and it turned out well.
I would advise to keep the grain bill simple, maybe 4kg marris otter, 250g caramalt or/crystal 40, 250g wheat,
hop wise I'd say bitter and aroma lightly with Target/Challenger/Fuggles or Bobek, and then how much heather you add is up to yourself,maybe judge by the handful, maybe a handful at the start of the boil, then a handful at 30, 10, and a few handfuls at flameout, Fraoch also uses bog myrtle aswell. I'm sure a good guy by the name of Calumscott on here made one as he sent it to me and it was cracking, I think he used some late honey in the boil aswell! ferment with a scottish ale yeast or safale 04 or something. hope that helps.