Buying SHS and RHS Steel.

[birchy]

You're better off phoning them or going to see them. If you know anyone who works at a fabrication company, they might be able to get "mate's rates". Have you also tried online suppliers such as metals4u, Hub Le Bas or one of the many eBay sellers? Another option to consider is your local scrap metal merchants as they'll have "offcuts", sometimes up to 2M in length!

Looks like you have plenty of steel stockists locally: http://www.yell.com/s/steel+stockholders-stockport.html. You should be able to get some prices within half a dozen phone calls.