C’mon Stew it is early for green manure!
I lifted this from "This Month" here:
Now is good for sowing carrots and beetroot outside, and it is time to sow Florence fennel, a little more kale for late plantings and the last dwarf beans for popping in any gaps in July.
Also you could sow beetroot in modules, chicory, endive, rocket, the list is long. Just time for sowing purple sprouting and savoy cabbage too.
I just planted some cucumber La Diva where I cleared the last Swift potatoes, and swede after clearing spinach. I sowed both of them a month ago in modules in the greenhouse. You should have some leek plants ready as they are good for second plantings after potatoes, broad beans etc.
Also I just created a new page on SECOND CROPPING under Useful Advice, with lots more ideas.
A busy time!