Well...I had two panes of glass blow out of my greenhouse. One had gone previously and I'd procrastinated fixing it for fear of falling.
Anyway...had one slipped roof pane to realign and re-fix plus the one that originally blew out to replace that. Managed to do it.
In the process, stomped over various pots that I couldn't bring myself to bin...so they're now out.
Managed to re-fix the large, gable end pane yesterday. Used one of the spare pieces of glass in the greenhouse to replace the apex of the gable end.* In the process, chucked out more stuff from the greenhouse.
I might actually be able to use my greenhouse in the springtime.
*When we had to move the greenhouse 12 years ago, the contractor - without checking with us - ordered and charged for a lot of spare glass.
Long story. I previously used one of the spare pieces, when someone broke a pane in the roof. (Glares in direction of neighbour.) That's probably why the glass blew out - I didn't know what I was doing at the time. Experience and Youtube has improved my expertise. I think I now have 4 panes left. Too damned expensive to throw out.