Can assure you that Blackpool C.C. site is definitely not closed as we just returned from spending a week there on Saturday. Also agree with the comment about booking in advance if wanting to visit any of the Blackpool sites during the Illuminations as they tend to fill up quickly.
If anyone wants to particularly visit Blacpool C.C.site it might be worth phoning the site itself rather than going by info on the web site booking facility. We were able to get on by doing this when online was showing as booked. Caravan Club site is a handy 5 minute drive from Blackpool town centre, toilet block and showers to normal club standard, children's play area, level pitches (all hard standing).
Robert