The updated etches for the Hudson-Hunslet arrived in the post this morning (thanks Steve) and at first glance they look perfect.
After the problems with the nameplates disintegrating on the first batch I'd gone for half etched plates which you can see bottom left. Steve thought it was worth a second go with a slight adjustment. Basically the idea was to combine the grill and nameplate and to tweak the lettering slightly to give more surrounding metal to help keep things together. You can just see this attempt top right of the full etch but it's obviously clearer on the closeup shot.
As you can see we tried a couple of approaches for a single part, but the top right is just perfect; it's etched through and still keeps the grill forward of the nameplate. In other words, SUCCESS!
The other problem with the first etch was that the folded part didn't fit properly as I'd drawn it wrong. A quick check and that problem seems to have been solved as well, so I can now start building up a second body.