@AndyD: Do you have recommended suppliers to source these from?

Personally I prefer the Schneider Electrical breakers. My issue with the Hager breakers are that they are lacking in the technical details about their product. I can't really find much online. And of the bunch they are the most expensive. Both Schneider and Chint have extensive documents detailing everything.

Lack of technical documents to me is a warning sign.

But admittedly I may not be searching in the right places