Thanks, all, for the encouraging comments and advice.
After a bit of washing and "dry-run(?)" lathers, I've had a go with the New Forest for the first time today. After some humming and hahing about which to use (I use creams, soaps and croaps pretty indiscriminately), I tried it on Ogallala Bay Rum soap. It certainly works up an excellent bowl lather, and has exactly the feel I like. So NF have a convert in me, at any rate.
I hope to see the Duke at the start of the week, and I'm looking forward eagerly to using it.
@BigBoar-thanks for that. When I get over the excitement of these new brushes, I'll be hunting out old ones in workshop, garage, greenhouse and drawers, in hope of finding some worthy of restoration. If so, I'll be in touch.
PS
Duke 3 now arrived, and I'm well-pleased with it.
PPS
I was so impressed with the NF2403 that I got a Tubby 2 to go with it. Already had RAD, but now BAD seems to have kicked in as well. In fact, I'm kicking myself for not getting some decent badgers sooner, as these bring out the best in every cream and soap I've tried them with so far.