None of the routings from the Canaries via the Tango routes (T16, T216 and T9) require any special training. Some additional equipment is required though. T16 requires aircraft to have two HF radios and two independent means of navigation. The aircraft based at Stansted meet these requirements. What you have to bare in mind is that these routes are procedurally controlled which means greater separation between aircraft. Add in all the airlines filing via the Tango routes to avoid French airspace and capacity quickly disappears. In this instance you were probably unfortunate. Jet2 will always try to get passengers on board and submit a "ready" message to try and bring ATC slots forward.