Had a talk today with a large supplier in Northampton.
He explained that they can get me rod as strong or as soft as i want. Adding more copper to the brass mixture will increase its strength.
This stuff would be made in Germany and then shipped over to the UK. The only problem is that i would have to order 500lbs :/

Really nice guy who told me that i could contact him for any metallurgy questions in the future..
Thanks..