Although many small English-made lathes from the early 1930s onwards (Randa, Winfield, Grayson, Ideal, Portass, et al) were of uncertain origin and many being re-branded, the specification, general appearance and detail fittings of the "Heavy Perfecto" all suggest that this rare model was an indigenous product of the company. Of approximately 3.5" x 18" with a gap-bed, backgear, screwcutting and tumble reverse, it was almost certainly manufactured during the late 1930s. Two clues clue to its dating are the V-belt drive - first fitted on a small lathe in 1932 - and the inclusion in the chip tray (on one example) of a belt cut-out in line with the headstock pulley. This latter feature confirmed that the lathe would have been available fitted to a stand with treadle drive - a system that, by 1946 and the re-opening of the civilian market after WW2, would have been almost impossible to sell.   
Of typical English design, with a flat top and "narrow-guide" vertical ways (just like a Series 7 Myford) the deep, heavily constructed bed had a usefully large gap and a saddle whose long wings would have given decent support to the cutting tool. Unfortunately the saddle-to-bed gib strip was on the rear, where it had to take all cutting forces; instead it should have been arranged at the front, leaving a solid contact at the rear.
Of simple, single-sided construction the apron mounted a set of (exposed) rack-pinion reduction gears though the handwheel was of a good size and the leadscrew clasp nuts in bronze. The compound slide rest was conventional - though the top slide had only three gib-strip adjustment screws on a relatively wide spacing. A thoughtful touch was the fitting of a very long support bracket was for the cross slide screw, an arrangement that gave a couple of extra inches of travel to use when working with a vertical milling slide. The micrometer dials  zeroed - and had neat, knurled edges - Screwcutting was through changewheels (identical in specification to those used on the Myford 7 Series lathes) mounted a V-shaped fork (an advance of the single-slot bracket often used on English lathes of this era) with the drive passing through a quick-to-use tumble-reverse mechanism with the indent spring loaded location.
One example (in blue, shown below) has been found with a beautifully-made, cast-iron countershaft with slender uprights and simple but highly-effective floating bearings of the type seen on Atlas and Pools lathes. The unit bolted to the back of the bed and headstock with the end of the castings that formed the backgear support being machined flat and tapped to provide an upper mounting point. Combined with double pulleys on motor and countershaft, backgear and the 4-step V-belt drive on the main spindle a total of 16 speeds was available that would have spanned something like 25 to 1200 r.p.m. The lathe also has an especially long T-slotted cross slide - and, mysteriously, the maker's name machined from the bed.
Another Perfecto Heavy" here