I feel that youself, along with many others, will not find what you are looking for. I have searched high and low for a U.K supplier of Nielson Bainbridge and I thought I had found one, that was untill you told us the above. I am not unhappy though, as I have been lucky in the fact that the frames I have needed have always been in stock and with me in the next post.
I do ask myself sometimes if Nielson Bainbridge deserve my custom, as I have emailed them many times and never had a reply! It is always the way, when a company get as large as them, they more often than not, stop caring!