I must say I have found our worcester combi a bit more awkard than
having a
hot water cylinder. I find you cant really have the hot taps on just
a
little as you need a certain flow before the boiler kicks in (so the
water
stays cold), opening it a bit more and the boiler kicks in and the
water
becomes mad hot, only when the tap is open about half way (a ceramic
tap) do
I get a nice hot temperature that doesnt scold my hands! I cant say I
have
had the constant hot-cold-hot... with a constant flow.

Which model have you got? You could always turn the DHW temperature
down on your boiler (assuming it's got one)!

we have the Junior 24i I think. Is there any adjustment possible on the flow
rate needed to fire up the boiler?