I actually had the same idea but never followed through with it. Thanks for trying it out and posting it here. However, I feel that this post really needs a screenshot (at least, if not a video).
Ditto - any chance of a photo/video Clive?


My local lidl shop has cooks blowtorches in at the moment, please give me an excuse to buy one 
Got some dough on the go, I'll take a pic tomorrow! (I'm a poet at didn't know it!!) 
Right, you got me thinking when the paint stripping heat gun was mentioned so I got mine out and decided to do a comparison test, Blow torch VS Thermal paint stripper set at max temp 650 deg:
The result between the 2 is very different. With the heat gun the bread developped a good colour but puffed up completely, so much so that it turned into a pitta bread with both sides seperated like a pouch (see photo). It wasn't a complete waste of time as at least I now know how to make those, and certainly better than Sainsbury's! However that's not what we're here for. The blow torch delivers a far better result in my opinion, but no, as George pointed out, not necessarily BIR, but as I said, as close as I've got. With the blow torch the bread doesn't completely puff up and shouldn't, only partially. The surface colour is more or less what I was aiming for and the bread remains whole apart from the bubbled areas, but that's the whole idea. As pictures speak louder than words and to honour your requests, here are some photos taken in order to visualise the results. One last thing I should add is that the thickness of the naan seems to play a vital role in the final result. It shouldn't be too thin or it's back to the pitta syndrome, too thick and it'll be stodgy. After analysing this point I think the ideal thickness lies more around 3mm than 2mm...yes it does make a difference! This is what I mean when I said that there is a knack to getting it right and success is not always guaranteed but when you do get it right I think it's well worth the bother.