Anyone care to conjecture on the earliest date upon which it would be
safe to move shrubs in the Midlands of England?

I'm champing at the bit atm and would like to get on with tidying up the
garden and rearranging the position of some of my shrubs that have
outgrown their space allocation.

I'd be grateful for any suggestions of when they might shut down for
winter, though I know really that it should be as late as possible to
ensure survival, so I'm answering my own question really.
--
Steve Jackson