An advert in this 1910 The British Journal Photographic Almanac declares the Regent Street Polytechnic - a former incarnation of the University of Westminster - as having, "The first, largest and most successful school of photography in the world." You will find it here.
This e-copy resides on the Internet Archive.
Thanks to Jo Barker for sending me the link to the photography periodicals section of The Digital Book Index. There are also links to early copies of Photograms of the year (copies of which are also in the library), which are gems! (see here for example). And there are other sections to explore: the Photography Collections page looks particularly interesting.