Posted: 01/07/2015 at 09:40
You can definitely plant the fast growing things like lettuce, spinach, mustard and various herbs including chives, coriander things like that. Potatoes you can keep sowing through to the end of August.
It's a bit late for most things, but I've sown this late, you just end up with smaller plants and not much yield. I've started tomatoes, pumkins, courgettes and sweetcorn this late, last year.
If you're able to make a poly-type cover or glass cover (maybe not this year but in the future) you can extend the growing season a tad, by about a month. Mainly because many plants, at the end of their cycle, need heat to ripen fruits and veg, not actual sunlight at that point. Eventually, about October time, the shorter days make the covered beds/green houses too cold for most stuffs.