You're all very kind indeed! And thanks Nelson for the suggestion of more hols - perhaps you could have a word with my boss?
I'm really very pleased with this, and it does feel like I'm really starting to get the hang of how adjusting inputs affects the tank. That's not to say it won't go pear-shaped again, of course, but I do feel a bit more in control (but only a bit...)
The only area that really doesn't seem right is left-front. It comprises a bit of HC, hydrocotyle verticillata and a small bit of anubias nana 'Bonsai'. I now feel that the hydrocotyle works best as an accent plant twining it's way through other plants, which it's doing elsewhere in my scape. This hides the untidy horizontal runners and seems to help it root properly. The HC is fun (after all my trials with it) but a bit of an irrelevance. The anubias is just dwarfed by the hydrocotyle, but I really like the dark green contrast of it.
So I'm thinking of putting something darkish green in that corner, no more than 12 cms tall, to take the eye up, around and back into the scape. Any suggestions? I guess a slightly larger anubias might do the trick - perhaps nana? Anything else?