4 LofC Signals distinguishes it from, for example, 2 Line of Communication Signals.  There were a number of different LofC Signals regiments, each with a different number.
Within 4 LofC, as with other regiments, there were a number of companies and alongside these a number of sections as you can see from the sheet you posted.  The extract shows only No 1 Company deploying initially with the sections listed.  We only see him in 4 Company in 1940.  2 Construction Section (my error earlier calling it Communications section) is on the sheet so he is on the page you posted!
MaxD