Manchester – Hull is about 2 hours drive?
Then get the ferry over to Rotterdam and short 40 min drive up to Dunirell in holland
Statics/lodges
On site pool w slides etc, indoor and out
On site theme park
Woods and great beaches nearby
Lovely little village
Easy to explore Leiden, Amsterdam, The Hague etc
We did this for 2 years until this year, had a full 7 days for 4 adults and a 4 year old for less than cost of a weekend/mid week break at Centreparcs, and that included overnight ferry crossings (we came back via Dunkirk-Dover to make it a bit cheaper so it was a long drive back but we stopped off for the day in Bruge so it was like another little holiday at the end)
Other than that local papers and the Sun are starting their £10 holiday deals again next week
Check UKhotdeals to get the codes early, and without having to buy the filthy Sun rag
Availability is sometimes limited but we have also done this for the last 3 years, you have to factor in cleaning charges and entertainment passes etc on top of the £10 per person but it still works out pretty cheap