David and others interested in the topic
Yes, sometimes medals to the RE can be very interesting when the rolls are consulted to see the individual's service. About twenty or so years ago, I did see offered on that well-known on-line auction site a single clasp (Cape Colony) QSA engraved to "Wireless Section". I had a go for it, but it went high even for those days. So much for those who would give us the line that the British army of those days was completely reactionary. My long- ago C/I training still leads me to think that even a crude wireless system would have made the guerrilla phase of the conflict much easier to prosecute - the Marconi not being reliant on laid cable and interference thereto.
Unfortunately, the wagon-carried Marconi system could not be made to work; the source you quote blames the arid conditions, and a source I read blamed the high concentration of iron-stone which interfered in transmission and reception.