John,
Had my office doing a bit of detective work yesterday afternoon whilst I was out.
It seems like this tractor was sold by M-H dealers Gibbs of Bedfont in Middlesex, which is way down country, so I wonder if it was registered by M-H in Manchester before it was eventually sold by Gibb's?
Interesting to read all their website history and connections with agriculture,
www.gibbsofbedfont.co.uk
They were in business from 1844 to 1997. Their connections with Massey ceased in 1958 and moved onto being a very successful David Brown dealer.
Interesting they note the photo as a "Pacemaker".
Malcolm.