With the box and the bits, and as the pistol is in quite nice condition, I'd say £110. I have a Junior the same as this, with the 'spur' at the top of the pistol grip. Made between 1946-1950 I think. Mine has original engraving at the back of the cylinder, below the rear sight, which was apparently done by apprentices at Webley, to hide flaws in the casting.
Very nice little pistols