Yacht sailing on the Thames

Just another sailing picture you might think, of a yacht heading downwind close to shore. But no, it was actually taken on the Thames, upriver near Putney, where there are mud banks and bridges, low bridges.

I've seen the boat motor by a few times as the mast can be lowered to go down river, but this is the first time I've seen her out sailing.

Single handed too by the looks of it.... impressive.