I've never had a BIR Bhuna, at least that I can remember. I usually make CK's, and find its an excellent curry, and one of my favourites.
But Vindaloo, I would agree, there is not a recipe on cr0 that matches the best I've had in a restaurant in the UK.
I'd also say that the best ones were clearly not extra hot Madrases either. More tart, more cumin, and a different sort of heat is the best I can recollect. This supports the vindaloo paste/green chilli theory possibly.
One day soon I will revisit the UK and ask members for recommendations on where to go for a top drawer Bhuna.