Welcome Bremerton, I suggest mulching on top, to preserve the soil structure which will be building next year.
How deep a mulch depends whether there are perennial weeds such as couch grass, growing among your green manure. If there were a lot of couch, you may need to use polythene as well, so check how clean the soil is of perennial weed roots, before sowing the green manure in spring.
Check for bindweed in summer too: if there is a lot, in 2018 you may wish to cover some ground with polythene for the whole season, to clean it, while cropping the rest of your area.
