I've checked out their website and I just don't think I can do it. Basically, the caravan home is owned by another employee through a sort of time-share scheme (?) so it is not possible to upgrade to one of the nicer homes in the park. I know that it is only a week and I am effectively passing on an almost free holiday but I absolutely hate that kind of set-up having discovered the world as an independent traveller over the years.
If we don't go, the 'owner' would probably know as his friend 'owns' the plot next door and will be there when we are meant to go. He keeps telling dh about the karaoke nights, "the best cabaret shows in the UK" and the huge breakfast buffet - these are things I would actively avoid in a holiday of my choice. Dh has already confirmed that he does not have any annual leave booked for those dates.
Is there a polite way of getting out of it?