Not really any help, but wasn't there an 'N' fitted with a Brockhouse transmission in T & M some time ago, developed for the RAF perhaps, can't remember now?
And in the 1970's an offshoot of County sold Ford tractors with Brockhouse instant-reverse transmission and big Farmhand loader, as the County 11F: http://www.cheffins.co.uk/lot/-1170655-vintage-0
Sorry if you've Googled all that already
1440276 - 1957 - working
1335674 - err - one day..
Claeys combine M103 - 1963 703129 - working
Ford 7710 2wd, 1983 - working