Correct, the address was 64A Mount Pleasant, a few doors up from the Liverpool YMCA where my mum worked in the late 1960s/early '70s. I remember the 'Hospital' well but there seems to be a lack of any info other than questions. Incidentally, number 64 was the registry office for Liverpool South where John Lennon married Cynthia. 64A appears to be be an added building.
This is a photo of the shop front as it looks today, courtesy of Tony Snell (BBC Radio Merseyside)