Just talking about bhuna is making me salivate, so I'm going to have to give this a go, 967bar.
Sadly, as has been said, what they call bhuna in BIRs these days is a pale shadow of the real deal. In fact the last proper bhuna I had was 15 years ago at what was then the best restaurant in the area (restaurant still there, but original owner/staff/chef/bhuna regrettably not).
Their Lamb Bhuna Gosht was to die for. Deep and savoury with a thick, clinging sauce that coated the palate with layers of spice...
If I knew where that chef was now I'd track him down and beg him to make me one...