Finally have most of the glazing completed.
I found the top roof panes the most scary to do, especially having to do it all by myself. So, I came up with this method which may be useful for anyone else in the same situation.
Firstly, I bought a cheap suction device for gripping glass, mirrors etc. I then attached it to a rope which was positioned over the greenhouse ridge. Setting the suction device on the glass I then placed it at the gutter level.
I could then pull the pane up to near the ridge and tie off the rope.
It is then easier to position the glass pane in the ridge line by manoeuvring it using the handle. I found this very difficult before having to juggle the glass while at the top of a ladder.
Here are some photos of the almost complete current state.
I only have a few pieces left to do which were either missing or damaged. These arrived today so should finish the glazing tomorrow. Then have to screw the base down (holes already drilled) and fit the automatic openers and louvre glass. Then staging to install, phew!