I've read that ground elder is good to eat if you catch it before it flowers. Since it seems to grow abundantly on all bits of waste ground, I might give it a try next year.

If the wild carrot is so invasive, I'll make sure I keep it in tubs, at the opposite side of the garden to the vegetable patch - it won't be so bad if it gets into the flower beds since that bit is a mixture of bulbs, sunflowers and wildflowers at the moment.

I had a bit of a google about wild parsley. The flowers look a bit like a yellow version of ground elder. Most of the first page seemed to be full of american website going on about how poisonous it is if you touch it. Most of the british sites just seemed to mention its existence and that's about it. I did find one mention in the British Journal of Medicine from 1982, describing the chemicals which cause the rash:

This is the link: Organic Gardening Catalogue where they list wild parsnip as one of the edible roots. They also do an edible leaves and shoots version which might be a better option if the wild parsnip really is that bad.

If I keep it confined to a tub and wear gloves whenever I harvest things, I may be ok but since I've read elsewhere that wild carrot isn't very palatable, I may go for the leaves and shoots version. I've noticed that one includes dandelion, which is a bit unnecessary since our garden is full of the stuff. I'd considered having a go at making dandelion coffee (after reading this page) but most of it is growing between the flagstones where it isn't easy to harvest the roots.