It's amazing what you find at the bottom of the garden. Not necessarily at the foot of my garden, but if you look at the Natural History Museum's Postcode Plants Database you will be rewarded with a treasury of vegetable wildlife which grows or has grown in Walthamstow. No surprise that there are three varieties of bindweed.
For the more whimsically inclined it's easy to be enchanted by the names of the plants, and I can't help be touched myself. Not only Trifid Bur-Marigold, but Dense Flowered Fumitory, Lamb's Succory, Spiny Restharrow, Tall Fescue, Biting Stonecrop and Night Flowering Catchfly. Even Yorkshire Fog. Not to mention hundreds more.
Perhaps if I took plants more seriously I'd be ecstatic about one plant that isn't on the NHM list. The Lee Valley Regional Park Authority and English Nature are trying to preserve Creeping Marshwort on Walthamstow Marshes. They're helping the plant survive by reintroducing cattle grazing, which I know is sensible but intuitively seems wrong.