As you can see, the upper thread has wrapped itself around that bar, catching the bobbin thread in the process - with every revolution of the upper thread it loops around the bar, tangling up. I visited John Lewis and the woman in the shop had a look at it, but it didn't cause her any problems and appeared to be 'fixed'. I used it successfully for one night, but as of today it's playing up again. The tension is correctly set and I ensured to thread it correctly as per the manual instructions. Is this a problem with the user (am I effing up?) or is it broken? Thanks!