Top one is a 303, made by Kynoch (ICI) in 1941 and it is a Mk 7, denoted by the VII, (you're looking at it upside down

)
The other two are modernish NATO blanks made at Radway Green in 1970, the 'L' number being a NATO designation.
The bullet could be a .45 cal but difficult to tell as it is quite badly damaged.
Oh, and they're folded at the end so they still BANG when you fire them, but don't shoot a bullet out.
