Bill,
I have the British Journal of Photography 1950 in front of me, in which the introduction of this lens is announced, along with the 9 cm f3.5 Xtralux.
Around this time Taylor Hobson,Dalmeyer, Ross, and Wray all produced lenses for the Leica camera, as Leitz products were unobtainable in the UK. your lens cost £37 + £16 tax when introduced, a hell of a lot of money. You could buy a new bungalow for £500!!
The Reid cameras were supplied with the 2inch Taylor Hobson Anastigmat only as new, I have one of these. The lens is superb, I bought mine new in1972 for £20, when the last of them were being sold off.
It was tested in the Amateur Photographer by Geof Crawley in 1990, alongside some much newer lenses by Leitz and equaled all of them!! I would think your Xtralux will perform well.
I can scan the article in the journal if you like, but its not hugely informative.
The Ensign Ross factory in Walthamstow was destroyed in the London blitz, and their ability to supply lenses to the market before 1950 would have been severely limited. A lot of equipment was announced several years before it was generally available, the Reid camera in particular.