Selgas
I would have to side with Oscar on this one – a pump connected to a circulating system would allow hot water to be available at every outlet point as and when required.
The current delay is simply that when you open a tap the water begins to flow and it just takes time for the hot water to come from the heating source to the outlet tap – that is your delay time.
To overcome the problem have a Plumber install a ring main pumped system as Oscar has suggested.
Swelled washers have no bearing on this problem lol 
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