Combi boiler installed - now shower doesn't work?

Three weeks ago I had a Baxi Duo-tec Combi 28 HE A boiler installed in my house. Very soon after installation I discovered that in the course of the installation the cold water supply to the tank in the loft had been cut off, which meant that I couldn't get a bath or a shower.

The company sent two guys out who reconnected the supply to the tank but now I can't use the shower (which is gravity fed and attached to the bath mixer tap) because the water comes out either very hot or completely cold and I haven't been able to achieve a steady flow at a comfortable temperature no matter how delicately I've tried to fine tune the hot and cold bath taps which supply the shower head.

I've recently heard that combi boilers aren't suitable for gravity fed showers! - which the boiler installer never mentioned!

Can anyone advise me on my best course of action now. Is the solution to install an electric shower? Or maybe put a thermostatic valve on the showerhead? I'd welcome any advice.

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