John's
This was the address of EMI Records, which Olivia had signed with starting with the album Long Live Love. I don’t know if the UK 1970s fan club “The International Olivia Newton-John Appreciation Society” had started by then. The earliest reference I have see is from 1977, which seems a bit remiss of Olivia’s UK fans who had been enjoyeing her performance on TV since around 1972 if not earlier!