52nd st Aviation changed their name to the name they now have at Doncaster.
Nothing to get upset about.
Sandtoft has nothing to do with them now.
Sandtoft is run by the owners of the airfield who USED to rent it to 52nd St.
The owners have a manager called Nikki who you will speak to if you decide to ring & make enquiries.
I fly at Sandtoft & enjoy my flying there.