Right that looks like it carries hot, neutral (or another hot), and ground. Do you have 120VAC available? You could just run your 120V stuff off a 120V outlet maybe. I don't know if all England is like this, but at my sister's house I believe she had 240VAC only, one conductor was neutral, and the other was hot, it wasn't a 'split phase' 240V/120V like is common in the U.S.
If you need 120VAC only for your control power, you could either use all 240VAC components, or possibly get a small control power transformer from 240VAC to 120VAC. If you don't need many VA's those aren't too expensive.