This one has me stumped and is not a 'normal' spoon, it feels wrong in a few ways to be a standard English Georgian dessert spoon. Firstly the markings aren't right and secondly the silver is so bright not like any London made pieces. It weighs 30 grams and is very soft to the touch and much brighter silver much like items found in China/Japan that are marked 100% silver. It's not that flexible though as normal 925 silver. The top of the spoon is a flat finish unlike most pinched forms like standard English spoons.
I bought it on the off-chance it was something interesting. If anyone can shed some light on where it comes from and the maker it'd be great.