Maurice, I've found this image from the Supermatic service manual for timing adjustments, sorry, I don't know if the lotus is the same but it might give you some clues as to where the hook and needle need to be.
Testimonial: "thank you Tally girl for your splendid and very useful information, \it looks as though various needlebar lifts should work. The current 2.2mm I am using lifts loop OK. Testing manually very slowly it seems that when the hook loop comes off that it needs quite pull to get it past where the top bobbin plate touches a fixed bracket in the chassis. I am wondering that if this thread does not get past quick enough the hook has collected another loop and could be the cause of the machine jamming Maurice"
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