This radio, that I helped to design, has gathered a cult status over the years. It was the radio used on the UK TV series called "The Professionals".
Some have been converted to use on 70cm. Before anyone asks, no, I
cannot help you find one! They are rare these days. I do not possess one and neither do my old colleagues. My best advice is keep your eyes skimmed in case any appear on eBay or at rallies. Looking back, we did not sell that many. We made more pagers in
one night, than the total number of PF8 units sold.
That was the trouble with PMR radios. Once we faced significant price competition, we just could not compete. These days you can buy UHF PMR transceivers for a fraction of the price 40 years ago.
On my website is a .pdf version of the manual.
In its day, way before cellular radios, it was quite ground breaking.
See
https://sites.google.com/site/g3xbmqrp3/vuhf/pf8