sudden drop in pressure

Hi all,
not sure if I should put this thread in this forum or the plumbing one.
I have a problem with my shower regarding the pressure- well it seems related to a pressure problem. I turn the taps on to mix hot and cold (independent taps, not a mixer). what happens is in a middle of a shower, there is suddenly a drop of cold water pressure and you basically burn yourself. Very often, when this happens, I can hear a noise like water hammer and this is a sign that I am going to be burnt so I step away immediately :)
Then sometime the pressure is back to normal and the water is fine, other times I have to readjust the cold water. Then later on during the shower I will freeze because for an unknown reason the cold water is back to normal.
I 'd like to mention that while having a shower, nobody or nothing is using any water (no washing machine, dishwasher, etc...)
I live in a part of Doncaster, melbourne where the water in the main pipe is renowned to have a very high pressure causing frequent water hammers - if that can help with the problem.

The shower in the ensuite does not have this problem. However the ensuite has a water saving shower head given by yarra valley while the one in the main bathroom is one bought from a plumbing show - and is supposed to be water saving as well.
Taps in the ensuite are probably 30 years old while I changed the one sin the main bathroom 2-3 years ago.
any body has an idea or even better the sale problem that he/she has managed to solve?
Thanks
eric


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