Depends where you are looking..as far as I am aware, the following companies still make there own blanks..
Harrison (Carp, Match, Specimen, Lure, Sea and Fly)
Free Spirit (Carp)
Century Composites (Carp, Sea)
North Western (Carp, Match, Fly)
Carbotec (Carp, Match, Fly)
David Norwich (Fly)
Bruce and Walker (Carp, Lure, Specimen and Fly)
I am sure there are a few more..I just cant remember off the top of my head.
I use Harrison a lot, also Century and when I can actually get the things, North Western. All excellent blanks, but relativly expensive when you look at finished rods comming to the UK. BUT, you are getting , in my opinion anyway
, much better blanks in that they are normally designed for UK fishing styles, for UK weather and for UK casting.