Which reminds me, here's list I've been able to compile of eps that were not transmitted this year by the TinyPOP channel on UK Freeview. NB: TinyPOP is for very young kids, so possible reasons might be cos some of the eps might be too scary, or the kids wouldn't really understand what's going on in the plot. Try to draw your own conclusions.
Not on tinyPOP channel: S4 E7. Bats!; S4 E12. Pinkie Pride; S4 E13. Simple Ways; S4 E18. Maud Pie; S4 E20. Leap of Faith; S4 E21. Testing, Testing, 1, 2, 3; S4 E23. Inspiration Manifestation; S4 E24. Equestria Games; S4 E25. Twilight's Kingdom Part 1; S4 E26. Twilight's Kingdom Part 2; S5 E9. Slice of Life; S5 E13. Do Princesses Dream of Magic Sheep; S5 E15. Rarity Investigates!; S5 E24. The Mane Attraction. TBH it seems the last 4 eps of season 4 were just junked as tho they had run out of time and needed to start showing season 5 in that slot?
Some things I could understand like Leap Of Faith, immitable behavior? I.e. bad idea to jump off a tall tower into a bowl of water? Ditto Maud Pie, dangerous adventure playground ending with hazardous pile of rocks, do not try this at home.
Bats!? Cos luvly fluffy Fluttershy becomes a monster? Do Princesses Dream Of Magic Sheep, scary and too weird and confusing?