When you’re packing make sure you have an easily accessible bag(s)/ pushchair that have all your swimming stuff/towels/things for the nipper in so you can go to the pool. You have to leave your car in the car park until 3pm (or is it 3.30?) so unless you get there late you’ll need something to do. Don’t go down to get your car bang on 3pm – they’ll be a massive queue. Same on your last day. Pack your car and leave it in the car park but go swimming/whatever for the day as you can stay there until 10pm I think.
Hire a trailer, or depending on your length of stay, it may be cheaper to buy a second hand one and take it with you (that’s what I did). They use Burley Cubs which are really good but I’ve got 2 sons so need something a bit bigger.
There’s a soft play in the sports complex, some great outdoor play areas, lots of widlife to spot (red squirrels at your back door – kept the oldest entertained for hours), nature trails, off piste mtb, etc, etc. Big bike locks.
Don’t get any of the ‘welcome packs’ – logs, food, etc. They don’t save you any money. The supermarket is quite expensive so take your basics (bread, cereals, milk, etc) with you if you can.