London: Fix shower in Earlsfield (ended)

Fix shower in Earlsfield

I am looking to find someone to either fix my current shower or advice/install a new shower. Currently to get it to work I have to take the shower head off the holder and place in the bath, when I turn the water on it comes out full pressure but cold for about 1-2 minutes, it will then drop to almost nothing for a further minute and then return to about 80% pressure and be hot and I can put it back on the holder. Also during a shower the water pressure will go back to full but come out cold. Unfortunately there is no make on the shower but it looks like a pretty basic one with two taps attached to the wall, one to turn water on/off and the other to change the temperature (however this tap is suck and cannot be altered) Please let me know if you think you may be able to help Thanks Anna PS. I've no idea what the quote will be as it will obviously depend on what actually needs doing.
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