Some big misunderstanding shown here over the TC’s powers:
The TC is answerable only to the Home Secretary
They deal only with vocational driving issues
The TC cannot act against a drivers licence, but is free to do as they wish with an entitlement
An HGV entitlement is granted and can be taken away by the TC as he/she sees fit.
A non-vocational driver would not automatically lose their driving licence for one instance of being caught using a mobile behind the wheel, but a vocational driver in front of the TC could easily lose their HGV entitlement - the starting point is four weeks but can be higher.
The TC will see a speeding driver as someone that cannot be trusted with the extra responsibilities of driving an HGV and will act against their entitlement in a serious way.