Forgot to say. There is a piece of plastic that is stuck across the underside of the sheet about six inches from the bottom which clicks into the frame above the windows and fills the gap. This should also stop the sheet from slipping.
It is stuck to the perspex with double sided tape which could have failed. You may need to source some fresh tape. Clean the perspex and the plastic piece. fit the tape but leave the protecting cover on the upper surface. Position perspex sheet. When happy lift, remove the protecting cover and then lower the sheet which will stick to the plastic strip.
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conservatory roof problem 
conservatory roof problem 