what shall i sow next?

So I've pulled out the peas and a few spuds from a school garden bed, and I've covered the soil.  I can sow some green manure, but any other suggestions please? Brassicas haven't been successful in the past.
Thank you
Fisher

perennial spinach?

If it was manured before the spuds, how about strawbs? Or late lettuce seedlings from a cut and come again pot  from Lidl (see previous posts) for some colour/interest until frosts.

Winter White Lisbon onions, rocket, spinach Polarbear and Bordeaux, there are lots of winter salad leaves available and now is the time for oriental leaves of course. I sowed some overwintering onions today as well - Paris Early White.  I've sowed some coriander leaf too and sneaked in a row of purple spring onions