Old Glory makes modern British? 
Old Glory UK bought Brooks Miniatures. I don't think you can get them from OG USA.
Might be worth an email to them if you're interested, though. Or maybe a UK LAFer can help you out.
To the OP - thanks for posting those, and nice work. Good to see that the various manufacturers all mix well enough. I must look again at TAG for the .50 and some prone figs. MTP is a pain in the arse, isn't it?