Not read post so sorry, just about to go to bed but stephens engineering in ware (Hertford) are the business. Might be a tad far for you though
Slight change of subject but I have been helping a guy at work rebuild his 911 box (synchro gone between 5 and 6 ) anyway he has been recommended by Porsche specialist to use automatic gearbox oil as it has same shear properties but is thinner as gives a nicer / slicker gear change ???? I know Ricky mentioned this and wondered if anyone else has heard of it ?
It's strange but there are several modern cars out there like the Ford Focus that has ATF in its manual gearbox. Modern stuff does my head in. As for ATF in a bus box I've never tried. Perhaps when I have no option with mine I may try. In the mean time I'd stick with what we know.