On the other hand the 20w50 Classic engine oil similarly packaged (but in nice British racing'?) green, metal can by Halfords seems completely impossible to obtain any further basic specification than a sales description simply stated on the can.
Funny

(e.i. An oil "Specially blended for Classic Cars from the 60s 70s and 80s where an oil of this quality....etc.........etc......... )
Have bought and used the Halfords in the past on recommendation from fellow Minor owners, just wanted a bit more info on the product, didn't think that was too much to ask for an item specifically aimed and sold to a specialist market ?