I was just perusing the thread about the flickering lights and followed the link to the IEE forum. The explanation seems reasonable to me.
I also picked up on a comment from one of the respondents who says he always fits type 'C' MCB's on lighting circuits.
I recently fitted 2 lots of wireline LV lighting in my kitchen, and found that the type 'B' MCB didn't like it much.
The problem is down to the fact that most of these new-fangled systems seem to use Toroidal transformers. I have had long experience in industry with these things and they almost always require either an anti-surge fuse or type 'C' MCB. Toroids are notorious for their high inrush current.
I have recently seen a Power supply system upgraded, the original used conventionally constructed laminated transformers, the new bits used toroids of identical VA rating and secondary voltage. Guess what? The toroids blew the fuses at switch-on.
The upshot of all this blather is that from experience, I would suggest that type 'C' is definitely the way to go if you are thinking of fitting LV systems with Toroidal transformers. - Electronic "transformers" -which are really minature switch-modes I guess- are not susceptible to the problem of course.

- Good point!
Not being involved on a daily basis as you guys are does have it's drawbacks
(That's my excuse and I'm sticking to it!)
- (Well, that and Alzheimers )