They aren't. The U.K.'s Seasons are just advertised differently. They are the same episodes as aired in the U.S.
In fact, the U.K. is actually behind in the episode airings. The episodes have already aired in the U.S. by the time they air overseas.
If by chance you're referring to the DVD sets, They aren't as well.
They are simply named a season ahead but they are the same episodes that air in the states.
This episode is called 'The Tan Aquatic with Steve Zissou' and it's from UK season 6, which is US season 5.
It's called 'Baby Not on Board' (US season 7/UK season 8)
In a cutaway on the DVD version of the episode 'The Former Life of Brain' (UK season 8/US season 6)
In 'The Juice is Loose' (UK Season 8/US Season 7) Peter says, "Nick Jonas is so cute." Hope this helps!
The episode's called 'Boys Do Cry' (UK Season 5/US Season 4), where Peter says: "Imagination Land, where you burp where you fart and you fart where you burp!"
Check the store know. It's bound to be there now since Family Guy is long past Season 7.
Dog Gone (US season 8/UK season 9)
In about ten thousand years bro o;
IN USA (part of Volume 1) - $30 IN UK (part of Season 1) - £10
This episode is called 'The Tan Aquatic with Steve Zissou' and it's from UK season 6, which is US season 5.
It's called 'Baby Not on Board' (US season 7/UK season 8)
Season 4|Episode 27 "Griffin Family History"
The episode's called 'Patriot Games' (UK season 5/US season 4)
The episode's called 'Chick Cancer' (US season 5/UK season 6)
That episode is the first one in season four - going by the UK version.
It's called 'Movin' Out (Brian's Song)' (US season 6/UK season 7)
The Griffin clan head south in the episode 'To Love and Die in Dixie' (UK Season 4/US Season 3).