Nope, all wrong I'm afraid.
The 757's are CAT 3b but due to LBA being a crap airport. i.e. The runways to short and its bent in the middle , plus its stuck on a hill that sends the Rad Alt do-laly they cannot autoland there. And Leeds being Leeds, when it's not windy, it can get very foggy.
However, the 737's may still use CAT 3a into Leeds.
Just Jet2 applying a bit of common sense!!