That's LAC flying school in the portacabin. Nothing whatever to do with Lancashire Aero Club, who no longer have a presence at Barton or any other airfield.
LAC flying school used to be owned by Lancashire Aero Club, hence their name - but were sold off when Lancashire Aero Club quit Barton. LAC flying school is now independant, albeit with same staff and instructors as it had under Lancashire Aero Club ownership.