How? A combination of curiosity and Google - "bebbspoke" is an uncommon word. I often wonder how people choose their online nom de plumes. Also I like to know a little bit about who I'm talking to - sometimes one finds potentially useful nuggets of information - like knowing there is an electronics expert with an interest in theremins close by. (Google Maps says 11 miles.) That could be handy for someone with a theremin and a fear of soldering irons. :-)
Hello, neighbour! I'm hosting a bit of a theremin get-together on the 28th and 29th of this month, at All Saints Church Hall in Croxley Green - 9am to 7pm - feel free to drop by if you're at a loose end. There's a more than fair chance there'll be another electronics whizz there (FredM) with whom to swap notes, not to mention some cracking thereminists.
(My name is Gordon Charlton, BTW.)