That is a really nice light double!
Although the engraving is not typical of an English gun, I kind of like it.
Looks like it could have been a Christmas present if only the leaves were holly instead of thistle.
The barrels look to be of Shoe Lump construction with the "shoe" nicely contoured on the sides.
Looks to be in well used but not abused condition but I can't give a good guess as to what it should be worth.
Can we get a look at the top of the action opened and closed. Looks like a rib extension there but cannot tell if it has a Greener style crossbolt or a hidden third fastener.