Hi Alan & Christine, The only sites we have visited in near Blackpool has been Kneps farm, its at Thornton nr Cleveleys, the views aren't great due to a large chemical plant nearby but the site itself is ok. As far as I remember the pitches were of a good size either grass or hard standing , the toilet shower facilities were excellent all individual bathrooms, I think access disability wise was ok but I'm sure you can check on that with the site.
The other site is the caravan club site that's situated at the other side of blackpool close to the end of the M55 motorway, obviously this is the usual CC standard as are the disabled facilities, not far out of town and easy to get to Starr gate for trams or buses etc.
Hope this is of some help to you.