I'm surprised no-one's mentioned VDF approaches (pilot-interpreted, as opposed to QGH which is ground-interpreted.)
Are there any left, in fact? I did overhear a QGH approach at Wyton a couple of years ago, so they at least are not defunct entirely.
Interesting questions though because my examiner on my last IMC renewal seemed a bit vague about it and was quite happy to accept a PAR until I pointed out it wasn't allowed...
Tim