Bloxham Shares (Query)

I bought a hefty lot of shares with an Austrialian company about a year ago with bloxham stockbrokers (quiet expensive at the time but it was my first time and had a problem getting someone who would deal with austrialian shares.)
My question is could i use!!! lets say open an account with NIB stockbrokers to sell the same shares. or mayby they dont deal with foreign shares. Any suggestions would be helpfull.