Just remember you need the correct information to feed in, or the information it produces is Dangerous.

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This is just a big thanks to all of you who helped me out with this. I have now completed the job. After carefully using the chart that Uncle Buck provided, it turns out that my current piping was adequate for the supply to the cooker point. I was mistaken about the layout of my current pipe configuration. There is a separate 22mm pipe exlusively for the boiler. There is another 22mm pipe coming straight from the meter that runs for 5 metres before dropping down to 15mm. The cooker is only 1 meter down the 15mm line and the fire is another 2 metres after that. There was ample flow for both the cooker and the fire.