Thanks again Bjorn.
I shall telephone the embassy tomorrow. I have heard that it's UK nationals that have to apply in person? Not too big a problem - I'd need to set off a few days earlier and collect it in person at the embassy in Brussels. Travcour advise me that I need to make an appointment but that the visa can be collected the same day.
Looking at your rough dates - we should cross paths somewhere. I'll be on my return leg through Uzbekistan, Turkmenistan, Azerbaijan, Georgia and Turkey (having come across Kaz, Kyr and Taj) I am on a tighter timescale so will do Uzbek, Turkmen and Azer in July. Turkey in August.
Keep in touch.