i am near Manchester--
I have been told it is a clone of the Singer 15---and just talked to an elderly retired repairman who said I can open the machine up and adjust the clamp on the bar for shank length! It is the way it was when I got it many years ago--not sure where the foot came from that was on it, but it worked fine till I lost the darn thing!
Not sure I am ready to try that yet.....