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Cold water overpowers hot water!?

I have a mixer shower.
If i just have hot tap on all is OK. [besides my burns!]
When i put even just a bit of cold water on, only cold water comes and no hot water - so it is freezing.
Does anyone know what causes this problem, and what I can do about it?

Many Thanks
ZTA, November 2007
uneven pressures

hispec plumbing & heating (essex), November 2007