Nice pics Mark
Methinks this bloke is offering an opinion based on a reputation fed by the biased yellow press of the day.
Sounded to me like he rode it himself & formed his opinion from that. No doubt the early design w the weird backbone could be improved upon, as it was in the fastback models. Both Roger Weir & Mitch said the Alrons handled well too. 125 engine looks too far forward in the A-E frame, but bigger-bore models look 'right' wrt frame geometry, ergonomics, wt dist etc.
Have just discovered another 'offspring' - 73 Tryan 400. Will try to post pics shortly & yes, its a rebadged Sprite that was apparently sold by Mitsubishi motors as a Tyran. One previous owner claims the taper on the sprocket didn't match that of the shaft = frequently sheared key. Ah the Brit QC of the day!