Thanks for the replies, and the argy-bargy with them
DD - Your love of peas is duly noted, I think some variety in terms of mange-tout and sugar snap could be managed. We have peas growing alongside the broad beans at the moment, but it's one veg that we can probably manage by the bucket-load.
Courgette?, maybe not from seed but we have a couple pot-bound (big pots!) that maybe could take a portion of the bed up and let it's feet grow.
The idea behind winter manuring is simply that our limited experience - last year - of over-wintering the beds was that this was, let's say, fraught, and a hard winter killed off our 9 month PSB crop and the overwintering onions suffered a lot this season (whereas spring planted is going strong). Any over-wintering we do do will be significantly limited this time around.
Other suggestions like lettuce and radish - already have a half-bed that's providing that, and a quick analysis of the contents of the fridge suggest we're now bored of radish - might let the whole 1/2 bed over to lettuce.
Pak Choi?, we tried baby PC last year, where it clung to the ground for dear life. Maybe a non-baby variety grown around the border, shouldn't interfere too much with the light for the peas. PC we would also use in the kitchen.
Carrots?, always lovely, but tend to be in the ground too long.
French beans - already got those climbing behind the greenhouse (~24 plants) so don't *think* we need more.
Kale? we're settling on tenderstem broccoli for the greens - quick and reliable from what we've seen so far. They're in the next bed.
Pumpkin - same family as Courgette?, if so then see above, we'll sacrifice a few sq ft to a courgette plant.
Sprouts?, nope. That path leads to divorce.
Thanks for the advice on the main-crop - I was getting itchy fingers to pull them (although planted later, are significantly bigger and heavier into flowering than the 1st-earlies). Interestingly, wifey planted some main-crop in bags in the garden (back-up plan for if the allotment failed / blight etc) - they've flowered and now the leaves are wilting back and generally looking sorry for themselves... that sound about right for plucking?