Adam
Always one to try something alternative - you could always try kohl
rabi - they are quick to mature. Also Chinese cabbage - provide
excellent yield and if cut before frost can be put in the garage or
somewhere cool and stored. Ok the outer leaves will wilt, but the main
heart of the cabbage will be fine - will last most of the winter.
More mainstream - there is a dwarf french bean called speedy - because
it is may need a little protection from autumnal weather. Some of the
white turnips are ok late, Ivory, which is a cylinder type rather than
the usual round has done ok for me in the past.
Most of the oriental greens seem to do ok from later sowings. If you
are quick in sowing and keep watered might even get away with red
cabbage

Clifford
Bawtry, Doncaster, South Yorkshire

- having spent the day budding apple trees and enjoying it - only have
to wait til next year to see if they have taken!