Imperial stout recipe recommendations

I'm looking for a really solid imperial stout recipe, ideally from a reputable source (I'm sure a lot of people have great recipes of their own but ideally I'd like to make something that been iterated on etc.). There are so many recipes available online that it's a bit overwhelming! I would like to condition the results on vanilla and potentially also coconut/chocolate. While I love bitter and roasted notes in session stouts, I'd ideally like something that edges on the sweeter side.

For reference (for those in the UK), I have really enjoyed the imperial stouts made by cloudwater that I have tried.

Thanks!