Like Curious Pax I'm normally inclined to defend Manchester, but if true, 2 hours to get through security in T1 is totally unacceptable and indefensible. Not seen it mentioned but it would be interesting to know if all lanes in both the main and Jet2 security were open and from what time.
That might give an indication of whether the issue was staff shortages, or a lack of security facilities or perhaps equipment failures.
And those sort of comments from the airport about the so-called reason being high volume of passengers are just patronising and annoying. As pointed out, school holidays have finished, so what might it be like late July when the main summer school holidays start and with July / August traditionally being the busiest months, unless corrective action is taken.