Wow is that a bad film. I was going to call it shockingly bad but I've just seen it's a "Sky Original" - so maybe that explains it (my experience suggests I avoid those).
Like many of the reviewers, I like Liam Neeson and am a fan of him in this genre but unlike many, I thought he put in a pretty poor performance. Maybe it's just because everything he had to work with was so poor?
Production level is fine but the writing, acting and directing really are not. It may be worth watching up until the first couple of fight scenes, just to experience the fight choreography - that's done by a "professional"?
All in all, it feels like the quality of some random school being given a production crew, big budget and the requirement to come up with a film within maybe a week!