Looks like it might be a Gnome - There were quite a number of enlargers made/supplied by a variety of companies, and this one looks very similar to one I have in the loft.
If you want a contemporary lens for it, send me a PM, and I'll see what I can find.
My first enlarger, bought when I was in student digs, was a Zenit UPA suitcase enlarger. It looked nothing like the one in the photo. Later I found a Gnome 2 1/4" square enlarger with no neg-carrier in a junk-shop and this design looks similar (so "generic British 1950's enlarger" would be about right). After making a carrier from mounting board I used that at home happily for years.
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