Janet
The Oaklands CP is not in Lytham, it's in Warton, some 3 mailes further east from Lytham.
My in-laws have stayed at this site and the one that Janet mentions, Bryning CP, which is (at the moment) a Certificated Location.
Their feedback from the stops are that the CL site is by far and away the better bet. I can endorse this, as I live within a mile or so of each one. If you can get on the CL, do it and you enjoy the better site (EHU/Water Hook Up/Grey Waste drain) for less