FCC sometimes use a prerecorded message that plays at intervals between the other announcements during hot weather reminding passengers to carry water with them.
I saw a similar message displaying on the depature screens this morning at GN stations.
FCC have also been handing out free water at stations, although even this is going down badly in twitter! And some seem confused as station shops sell water for over a quid-but that is nothing to do with FCC-the free water they are handing out is free but funnily enough you don't get it from the shop next to the ticket office!