My winter wheat was sown in October and germinated within days, actually I think it was already germinating when I got it. ( I swept it up off the road, I had been expecting the owner to retrieve it but once it had got wet decided to help myself.) It stayed green all winter though was nibbled by deer and then when the soil thawed out and it had grown a bit more I simply turned it down into the soil head first. The rhubarb that I then planted on top is doing extremely well. A few wheat plants survived and I have allowed them to grow.
Many thanks all for the info, might try and buy some rye and give it a whirl.
I sowed some Red clover a couple of weeks ago and it is now a nice little clover lawn. I think with clover you need to get it in early but for me every inch in full so there is not much space to put it. It is currently under tenderstem brocolli.
I find that the legumes just get eaten, could be deer, rabbits, or squirrels, so a bit of a drag to have to net it.