The only way I could possibly defend the smartlynx aircraft in that respect is to say that maybe TCX are utilising that aircraft more than JET2 and EZY utilise theirs. Looking at the programme for that particular aircraft its programme is jam packed from Friday through to Monday. So if anything goes wrong during that time its going to have a major knock on effect.
Correct me if I'm wrong but I'm sure Easyjet and Jet2 don't operate proper night flights, ie, departing at say 9/10/11/ in the evening, which gives them more ground time to get any issues corrected before its morning departure.
If thats the case then it should definitely be something that TCX need to look into further for the future. As not only will it be costing the company a fortune in bringing in extra aicraft, theres also the issue of this EU regulation regarding the delay compensation.