"Paul D.Smith" wrote

OK, you've guessed it; the entire greenhouse slipped 6 inches sideways
this
weekend in the gales. Remarkably, no broken glass.

Well... Concidering the laws off phisycs the first is most probably the
cause off the second, the force off the wind was demped by the movement. If
it would be fixed the pressure on the glass would be more intens, and the
glass would have broken.

Marc (but unfortunately I know litle about gardening)