The article had a Webley Hawk (can't remember which one, probably a Mk 2), a BSA Meteor (think it was a Mk 1) and the other may have been a Relum Telly or similar break-barrel. I know that the Relum Tornado can be imporved by junking the inner mainspring, fitting a Meteor mainspring and a floating spring guide made of steel tubing.
Brema, which is an Italian company, made a copy of the Original/Diana 35 (not the Weihrauch), but it's trigger mechanism was far less sophisticated and the reviewer thought it a rather crude air-rifle. Interestingly, one of the few Indian air-rifles was also a copy of the Original/Diana 35.
You can still buy the 'Panther' air-pistols, I think the company's name is IGI and they were called the RO71 and RO72.