Well I've established that the tailshaft flange is:
(a) the same as a bluebird h190 (by eye only, yet to measure)
http://i.ebayimg.com/00/$(KGrHqYOKpEE0VpV8Mw1BN(vIGpiF!~~_12.JPG
copy & paste this as it's not recognising the link properly
(b) different to my 120y flange (rear diff, this is the borg warner apparently. front diff is the h190)

I will know more about brakes when I get my hands on a bearing press.