Where to Go
There are tonnes of places to pick your own dinner in London - it's just a question of keeping your eyes open. Walk pretty much anywhere remotely genteel in the late spring and you will see Elderflower trees, for example. Grab a dozen blossoms and you're in cordial for the whole Summer!
Look at the picture - we're hungover and picking Elderflower heads from the neighbouring pub's garden: call it revenge if you like!
So far we've encountered plenteousness in the following parts of London - follow the links for what we found:
Hampstead Heath
Blackheath
Greenwich Park
Walthamstow Marshes
Highbury Corner