Bit vague mate, what lengths do you need, what thickness material, what are the dimensions of the section, where in the uk are you, its something you'll have to get formed up on a press, a local sheet metal work company would be the best bet, or if there's a decent quantity a company like these will help you.
sorry i need about 12 mtrs 20mm wide in the channel and about 20mm on each of the flanges and about 1mm thick the measure ments arnt set in stone
the job i am doing is flush hatches on a boat deck thank you in advance
Yep, easy job for them to be pressed up. One thing to think about, is the lengths you need them in, it might be cheaper to have them in 5no 2.5m lengths than 4no 3m lenghts