"Yes it is!"...
I truly can't believe that she'd get such a simple tree identification wrong. Sycamores don't have little round seed bodies, they have helicopters, little paired wings which flutter in a spiral to the ground, big trees that are probably the easiest trees in the world to grow, a gardener's bane in Britain.
The wood's traditionally used for butchers blocks and breadboards, rolling pins, bowls, furniture frames and kitchen tabletops. Fiddle backs, carved ornamentation, hard, close-grained, but not much good as construction timber. I'm no stranger to sycamores, I've cut a few down, fallen out of others, and brushed and raked many tons of sycamore leaves over the years. They're pretty enough, but if you park your car under one you'll curse, as within a few hours it will be covered in sticky spots of sugary sap, aphids, caterpillars... Sycamores are far better as somebody else's tree, to look at from a distance.
But the Sycamore of Britain is Acer Pseudoplatanus.
I've got a whole big new stack of learning to do.
P.S. Blogger's new interface is driving me mad. If there is some strange spacing and layout on your screen, well, I'm trying to find the errant html, but I'm not an html person, and I'm ready to throw bricks at the computer. Curse you, blogger!