[mischief mode ON]Let's blame Ryanair anyway...
Additionally, the controller was aware that EI-CJI was clearing Runway_06R, was now ahead of the previously landed Boeing 737 and its operator was known to have a company culture of expeditious taxiing.
A review of the location indicated that G-SMTJ would have been visible as EI-CJI approached the crossing position. Although the commander of EI-CJI considered that he had looked to his left, this was not effective.
Additionally, the high ground speed (33 kt average) of EI-CJI may have made a late stop more difficult. Checks with the operating company of EI-CJI confirmed that the maximum ground speed whilst taxiing should be 30 kt. However, the flight crew had been requested to "Keep your speed up" and were complying with the ATC request. It may also be relevant that the Air 1 and Air 2 controllers were aware that the crews of the operating company of EI-CJI were expeditious on the ground.
[mischief mode OFF]