Thanks for your replies - appreciated.
I should have said that I'm not interested in electric bikes (Raleigh) and, unfortunately, I very much doubt I could afford a custom-build based on the Rohloff hub gear (Shand & Thorn). The Pashley Morgan 8 looks interesting though.
I haven't actually set a budget yet as I just wanted to see what my options are first but, thinking about it, I wouldn't spend much over a grand. There were certainly more mainstream internal hub geared bikes available when I last looked (several years ago). Shame.
Anything out there with Shimano Nexus/Alfine 8 or 11 speed gears?