Currently he has 1-2 days of no food per week as I have advised
When he does eat, his diet consists of:
50% Broadleaf/Ribwort Plantain
15% Young Dandelion
The rest is made up of varying amounts of Basil (his favourite) Fuschia flowers (in summer), Bindweed flowers (in summer) Forsythia flowers (in spring) Sowthistle (flowers as the leaves look super spiky and sharp) Bramble Flowers, Red Clover, Pineapple Weed, Pansy (wild and no pesticides) Rocket (very small amounts), Watercress (very small amounts) Use to feed Rosa Rugosa leaves/flowers (see below)
On occasion (when I am on holiday) bagged Salads containing Frisee and Lambs lettuce to mix with Dandelion (as easily identifiable) for family members to feed safely in addition to Brussels Sprouts leaves, though he does not like how rubbery the leaf is, takes him 2-4 minutes per bite!

Not terribly varied is it? I want him to enjoy a happy and healthy a life as possible! So I am trying to locate more of the safe to feed weeds to give more variety: Hawkbit, correctly identified Ground Elder, Cat's Ear, Pampas Grass flower (is it a flower? the feathery thing we used to chase each other with as kids)
I have a Rose Rugosa bush opposite (outside a restuarant) I was happily feeding him a small leaf or two every couple of days, and then I saw someone spray some kind of weedkiller around it, the bush is fine but all the weeds underneath rotted away. I assume the bush is now out of bounds? Haven't touched it since
I wash all of his food and powder everything with cuttlefish 'bone', this is a good source of calcium?
Any input into any of the above would be fantastic, I am always worrying about whether or not he is happy and healthy!