With crops like Mangetout and other similar peas you have loads of time. Cropping is just around 8 weeks from sowing so you can go as late as August - or mid August if you want.
Kale wise - you are also fine - and now temperatures have dropped a little you will probably do better than earlier sowings.
The mange-tout will be fine to sow early or late, I tend to go against the grain & sow a large early batch & a large late batch, as there is so much to eat in the mid summer that I find it nice to punctuate with 2 large harvests, so you'll be fine to keep sowing these indoors or outside for ages yet. All the things I've read about mange-tout suggest its best to sow in modules & with the weird weather this will ensure good results on germination.
Most kales are fine to be grown as winter veg, but benefit from being sown a couple months before it gets cold.
Una. My Cavelo Nero are outside at the moment & so far (touch wood) haven't been too affected by the dreaded cabbage whites. Hopefully the'll do OK.