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I thought you said it happened on the kitchen tap too, so it surely is the boiler?
Obvious question but you're not using the dishwasher/washing machine etc at the same time are you?
Also is your boiler on eco mode? On ours, all that does is prevent the boiler from doing it's normal thing of keeping a little bit of hot water ready to go as soon as you turn on the taps. Doesn't seem to make much difference to energy use and means you have to wait longer before the shower temperature steadies out.
lemonade
Ok, plumber says absolutely nothing wrong with the boiler, although he can’t explain why the shower hose jumps around with (assumption) pressure fluctuations.
His recommendation is to set the water temperature to a comfortable showering temperature and not add any cold water at the mixer tap.