You would think on a rabbit forum that that photo would get some response, poor Peter ignored in his old age.
I've only just come on forum tonight. Was thinking "What a fantastic garden" I didn't know there was limestone in Lincs it almost looks like parts of the peak district. the watering can, terracotta pots, & beehive,rhubarb & perhaps a row of raspberries - idyllic for me. I don't think you would get much forage from it though - a bit too weed free.
Re The worries. 1st. think about the wildies. They manage just fine in a very small locality. A 3 year old wildie is an old wildie, so we can't collect forage from the verges of heavily contaminated areas eg motorways/ dual carriageways etc because of a potential for toxins to build up. A country lane is just fine. Think where does our hay come from? Where has our own shop veg come from? Outdoor fields complete with all the wild life.
Re dog walking, It's a minute risk. Watch dog behaviour - they run around a lot when released, & almost immediately do a pooh/wee. A few weeks later after some rain you'll see that where a dog has poohed a tiny patch of grass is exceptionally green & tall. (It's had a dose of good fertiliser) It's as easy as that to detect where dog walkers start their walk. It's far more important to steer clear of wildie warrens.
I also live in an arable area. We crop spray insecticide x1 usually in May, & all farms do it within a week of each other. After harvest there's a spraying of fertliser before ploughing.
You can see if a field has been sprayed with insecticide by the tractor wheels flatten the grain in the field. The spray is from long side booms. So you see this very distinctive pattern in the grain of 2 tracks close together a wide gap & then another 2 going up & down the field.
I also live where chalk is very near the surface. The most difficult aspect of foraging for me, is chalky soil dust during drought. If we've had plenty of rain - fine. If not, I have to wash the chalk off, or Benjie gets sludgy urine.
Re I/D There's usually an annual foragers thread, where we can share tips, reassure, & if you want some backup, post a photo of the plant you're trying to identify & you'll get some help.
It can be very difficult to identify a plant when it's just started growing. Much easier if we have leaves & flowers or leaves & seed heads.
The beginners plant I/D sticky has photos of plants which grow commonly & are incredibly difficult to confuse with something else. Take a look at the poisonous ones too.
Enjoy your foraging trips - there are birds to see, signs of small mammals & insects too. I love it.