This isn't the best pizza deal in terms of the amount of food you receive but it's good value when you consider the 2 cinema tickets for the kids would cost about £10, so everything else on the table is under a tenner.
The deal includes:
Any Large Pizza, normally £12 * Potato Wedges normally £3 * Garlic Bread normally £2 * 2 unlimited trips to the Ice cream factory (i'm not sure how much this is exactly but i can't imagine it's going to be any less than £5-£6)
2 child cimema tickets, my local charges £10 (£5 each ticket)
This means this deal is worth about £32-£33, saving you around £13 and this is available to eat at the restaurant but as this obviously doesn't include any drinks, i would recommend getting unlimited refills for slightly extra than the standard drink price, as there's a lot of food on the table, even if you get 2 drinks per person, it works out a lot cheaper than the standard price.
Hope this helps. :)