Good News!!!
When I started sewing with The Splurgess this afternoon (yes , I know Esme but I had to) She was back to her normal smooth purr!
This may well be that after play yesterday, I took off the accessories box and gave her a good shake ... I think it must have dislodged the pin.
I will however try and gain access by taking the bottom off the machine (If I can) and see what falls out!
Thank you for all you help xxx