We based this decision on the information that he presented to us. Obviously if he said that I would have to wait 3+ minutes in the kitchen and all my taps would be affected I would consider this an necessity rather than a luxury item for comfort.
I spoke with Mak, really nice guy so thank Howsie for his details, he said that if it had been him he would have put it a secondary return into the design for a 3+storey house automatically and not even asked the client if they wanted it.
When I texted Mak I actually asked if he thought I was to blame as this is something that has been on my mind a lot. He replied back and said it was their fault because of the information that was presented to me.
I am very grateful for all your help and advice that has been given here. Of course I really, really regret not going ahead with the ring. My house is just finished, I have a baby and a young child, so the idea of the house been smashed up again makes me feel completely ill.