Looks like CRT have invoked clause 12.3 of their T&Cs viz:-
12.3. If You repeatedly breach these Conditions, fail to pay for the Licence or We reasonably believe that there is serious risk to people's health and safety, or of damage to any property or pollution, We may do one of the following: 12.3.1. immediately suspend Your Licence. We will investigate to decide whether the breach can be put right. Whilst Your Licence is suspended You may not use the Boat to navigate on Our Waterways. The Boat must remain moored where We tell You whilst We investigate. We will tell You when and if the Boat can leave this mooring location. You may move the Boat before We complete Our investigation if You remove it from Our Waterways; or 12.3.2. terminate Your Licence immediately. This can happen if We decide the breach cannot be put right. We will also terminate the Licence when the number of repeated breaches is unreasonable and/or likely to risk the health and safety of others. We will not refund any suspension period or remaining licence period if the Licence is terminated under this Condition 12.3.