Ok here is the new cover just fitted ,even got out a spirit level to check
OOH bit of a nuisance. when the cover closes it makes a terrible noise, metel against wood, so had to find a solution.
AS I tend to keep everything of any use in my workshop I still have rolls of what should have been fitted into the greenhouse glass frames but the grass was too tight to use this insulation strip . So stuck pieces along the bottom and up the sides and it works. Crude but effective
THis made an excellent item in deadening the flap closure as seen in picture 2. Just got to fill the old screw holes now