Older contracts vs newer contracts (sundays)

[postiewhite]

So im a bit confused .
People who recently started with RM have got these "newer" contracts that have sunday included in them. My GF started with RM 6 weeks ago and was put on a Wed to Sun rota alongside some of the other new starters. Now when I looked at her contract it states that the work can include weekends, there is no mention specifically sunday, however weekend does include a sunday.

Anyway I started in 2013 and I have just managed to fimd my old paper contract which was originally set at 23.40hrs over 3 days (this was the job advertisement I went for). Now looking at my contract this also says work can include weekends.
So how is it that the rumour (if you like) that it seems to be the new starters doing the sunday work when actually half of the office could be on this type of contract?
So is there anything new about these 'new' contracts compared to someone that has been there 8yrs?

[Woody Guthrie]

When you started delivery did not include a Sunday.

Contracts are not just about words they're also about context as well as existing and evolving agreements.

My paper contract (if I could find it) has me working 42hrs 6 days a week for a handful of gruel.

[weary_posty]

Is it not the case that when agree a new deal out contract changes to reflect that?

If not I should finishing at 12 everyday and earning a lot less.