The NW Nature Nut has asked what a Throstle is - and yes, it is indeed a Song Thrush. But Throstle is a good name and I'll try to use it in future. Many good country names have been lost as the world becomes homogenous.....the bird was also known as a Dirsh, Drush, Mavis, Thirstle, Whistling Dick, Trush Dush and Throggie, depending on where in England you were.
Rather less inventive, it was apparently known as Grey Bird in Sussex and the south west. I owe this information to All the Birds of the Air by Francesca Greenoak.
On another matter, it's a conundrum that Dover (like most ports, a bit of a dump) can look quite beautiful at times. Blue skies help, I suppose.