Water Pressure Problems

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Hi. I am about to have a loft conversion built with a en-suite. Currently I have a Potterton 28 boiler (non condensing). The usual story, if the shower is running and someone uses another tap, we loose water pressure in the shower. The overall water pressure is okay in the house but from the mains we have an old lead pipe coming into the house. The question is. If we put a new pipe coming into the house, would this sort out the problem and would it accomodate two showers running at the same time. Please note I do not have the finances to put in a mega flow. The other possible thought I have if the above will not work, is to have a second boiler put in the new loft conversion. I would be grateful for your advice.