First step is to positively identify the collet type and whether the lathe conforms to the WW (Webster-Whitcomb) standard dimensions. If it does take WW or B8 collets and if the center height is 50 mm, then finding more collets and a T-rest or slide rest will be fairly easy, though you may have to search in other countries.
The reason I raise a doubt about this production lathe is that there are other lathes that look like WW style lathes, but are made to different dimensions, notably center height, bed width and collet type. The most common example is the Derbyshire Elect 10 mm lathe.
G. Boley WW watch lathes were near exact copies of the original WW lathes made by American Watch Tool Co. from around 1888 and, after 1911, by F. W. Derbyshire Co., both of Waltham, Mass. The G. Boley WW copies were sold by the thousands in the USA, along with G. Boley copies of the Moseley lathes, a USA competitor different from the WW design. Both G. Boley and Derbyshire made some design changes over the decades, notably to the tailstocks, but the collets, center height and bed width remained constant, so accessories from different makers and eras will interchange.
I can see that the headstock bearing design of this production lathe looks very different from the WW design. Standard watch lathe designs are described in several books, but they only deal with common bearing styles and how to get them apart and clean them. I think the industrial type machines by G. Boley were very seldom imported to the USA and would not know where to find information on them, beyond the Lathes.UK website. They are probably much more common in Europe. The American demand for small production precision lathes was mostly filled by Derbyshire and also, after around 1950, Levin.
Larry