All our boilers are Combi Boilers (exept flat 1, 18), they do not use storage, they just heat the water as it is needed. As long as the timer is set correctly you should be able to get hot water whenever you need.
Set the water temperature on the boiler to HIGH. If you want the water cooler turn on the cold water tap on the sink or bath
To get the hottest water dont turn the hot tap FULL on, the reason being that the boiler is heating the water as it passes through, so less water = hotter water.