With regards to LS changing from 752's to 738's, it will in fact have a pretty big effect. Jet2 alone represents a loss of 736 seats per day on last year.
736 seats per day? Really? 752-235 seats / 738-189 seats. 2 flights per day per A/C 46 seats per flight x 4 flights is only 184 seats per day by my reckoning unless I've missed something?