I get a mental picture of a complete poly-glazed greenhouse sailing by at low altitude.
It's only a theory though.
Its not! Mums mad it over fence and missed neighbour to end up in next lot of gardens, Did we laugh or what! :D
Sent her a text the next day saying I had just been overtaken on the M25 by a greenhouse doing about 80 with a tom plant hanging on for fear life :-X :-X :-X