Granville lathes were marketed by the Corbett Company of Sutton-in-Ashfield, Nottinghamshire, England, a company founded by Mr. James Lesley (Jack) Corbett, a native of Mansfield, a nearby town. Apart from a re-badged, slightly modified and V-belt drive version of the London-made Grayson lathe, and the use of bankrupt Winfield stock to make the "Corbett XL" lathe, so far as is known just three different indigenous models were manufactured: the "Junior" and "Senior" - both well made though entirely conventional machines and typical of those made by smaller UK manufacturers - and the rather different and more ambitious "Star".  As a point of interest, if you find a Corbett XL lathe, some of these have the Winfield name crudely chiselled off, while others cast-in Corbett's lettering and proper maker's plates in place. A known example of this type, a Granville XL 41/4" x 20", has paperwork confirming its sale in 1950, indicating that Winfield either had surplus parts to dispose of or their commercial failure (or cessation of production) happened well before the formal winding-up of the enterprise in 1952. Interestingly, these XL lathes appear to have used the older style of Winfield headstock with the backgear clustered against the front spindle bearing - yet have a much superior carriage assembly (with a wide and long cross slide) looking very much as though it was copied from the Pools Special (see the example shown below). A small vertical and horizontal miller was also produced (in what must have been very limited numbers) with a dovetail top to the column to mount the heads and overarm, and a side-mounted V-belt drive countershaft  A good deal of confusion surrounds the origins of the Granville machine tools with some Senior models carrying an inscription on the screwcutting chart that read, Granville Senior, F. Coals. and lathes have been found numbered both with and without an "FC" prefix as in FC 1021 - a machine that is still giving good service in Aberdeen, Scotland - and 0913 in New Zealand.  It is known that Freddie Coals was the owner of a machine-tool works, just off the North Circular Road in London, and was responsible for manufacturing both the Senior and Junior models. However, apart from the badge, this connection was never publicised and the exact nature of the tie-up between Coals and Corbett remains, for the moment, unexplained.
The "New Granville Junior" 3.5" x 18", introduced in 1954, was Corbett's second model to bear the "Junior" title and has always been a comparatively rare machine on the second-hand market. This model was designed much more along the lines of the Company's "Senior" lathe and featured a No. 2 Morse taper tailstock, tumble reverse, a built on all-V belt countershaft unit and with both changewheels and backgear covered by cast aluminium guards. Spigoted into the bed with a rectangular tongue (along the lines of a Myford 7) the headstock of the Junior carried a spindle running in half-split bronze bearings and bored to allow a 5/8" diameter bar to pass through. Six speeds were provided, between 60 and 720 r.p.m. whilst the spindle nose (11/8" x 12 t.p.i) and leadscrew thread (8 t.p.i 5/8" diameter Acme) were both identical to those used on the Myford 7 Series lathes - with which, upon examination, you might notice it shares several other design "clues".
Eleven changewheels, from 20 to 65 teeth, were provided for screwcutting. The gap in the bed could accommodate a job 10" in diameter by 2.25" thick; although V-belt drive was fitted as standard, flat-belt secondary drive was available as on option. Accessories included plain and swivelling vertical milling slides, 4-way toolpost, machine vice, leadscrew handwheel dial thread indicator and various sizes of angle plate.
Although relative short at 39" overall, because the countershaft top was angled steeply backward at its top the lathe was, for its size, an unreasonable 28" deep front to back. The lathe could be supplied in several forms: with and without both the countershaft unit and backgear assembly and with a choice of either V or flat belt drive. Its selling price, unlike that of the more expensive Senior model, closely matched that of the ML7, its closest competitor.
Widely advertised in the early 1950s the heavily-built and very robust "Senior" lathe was finished at first in a shade of dark green, with later examples - and by far the great majority - in grey. Although modern in concept (with the exception of the simple split headstock bearings) with all-V-belt countershaft unit, full enclosure of changewheels and drive system - and constructed with a deeper and heavier  bed than the ML7 (and enjoying a greater capacity) - it was priced at an uncompetitive £68 - some 40% more expensive than the contemporary Myford.  Naturally, with such a handicap it too, like the "Junior", failed to match the sales success of Myford. The Senior was originally produced with a 3.5" centre height but, by late 1954, this - to improve its appeal - had been increased to 4".  Some examples of the senior have been discovered with "Lindeteves N.V." badges--presumably the name of a Dutch importer.
Another lathe sold by Corbett was their "XL", but this was just a surplus-stock Winfield with the maker's name crudely chiselled off the bed. An example is known with paperwork supporting the fact that it was purchased in 1950, two years before Winfield's  bankruptcy. However, it is possible that either surplus castings were being sold off, or the company had ceased trading some time before the conclusion of legal proceedings to wind up the enterprise. 
Details of the Granville "Star" lathe here.
Granville also marketed the Centec 2 milling machine, using a particularly heavy cast-iron stand - one quite at odds with the fabricated affair offered by the parent company.
Tony Griffiths