Most building tradesmen have a radio playing whilst they are working construction buildings or new houses on site.
The Phonographic Performance Ltd. which collects money on behalf of musicians and performers, say that a licence is required if music is played in public.
The PPL webiste states:
3. What is a 'public performance'?
Music is performed 'in public' when it is performed outside what could be regarded as the domestic circle or home life. This includes music performances "of live and recorded music or music from TV and radio" in premises from concert halls to corner shops.
For example, the composer's audience in a workplace would be people at work, whether in an office or staff canteen, a factory or the kitchen of a restaurant. A workplace is obviously not a domestic environment and therefore a Music Licence is required if our copyright music is being used.
Therefore all tradesmen with radios must have a PPL licence.
