Shell Casing Help

[Metalthrower]

Hi All

Clearing out the shed for a poorly relative and came across this shell casing.

Being new to this and knowing Google is my friend I have tried to work out what it all means. So the bits I can work out

4.5 HOWR
22 6 10 - Manufacture date?
Chapel Armentiers Sep 1915 - Battle of Loos
CFF - Cordite shell?

Any help please on the other markings would be much appreciated.