The fence at the top of my back garden, owned by my neighbour, is
broken and falling down, basically it's a wreck. Cats get through and
attack the birds in my garden. It is also in my opinion a security
risk from burglars. My neighbour wont fix it

I would like to plant an extremely nasty, anti cat, and anti burglar,
hedge. I would like something that grows relatively quickly and that I
would be able to prune with powerful electric hedge trimmers. 5 ft.
tall would be my target height. I plan long-term to remove my
leylandii when the hedge is formed.

Any ideas? Pyracanthea, Rosa rugosa, or berberis. A bonus would be to
have butterflies and birds attracted to my hedge.
Phil of Whittlesey Peterborough England