Every time I stroll round a London park I'm frustrated by not knowing
the names of the trees, particularly those that have obviously been
around for ever. There is one in flower in St.James Park at the moment
which everyone was stopping to admire (and smell). These days one might
expect there to be a plan of such things online. Sure, in this case it
would mostly be plane, but there are some unusual ones too. Anyone any
ideas how one might get this information? TIA