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Thank you for the advice. In your opinion is it not even worth fitting a NRT to the hot then because it will simply reduce the flow further?

either that or fit a pressure reducing valve after the shower t and crank it down to same pressure as hot
 
Thank you everyone, these are all interesting ideas but I'm guessing by the sound of it, although there seem to be ways of stopping the cold water flowing back into the hot there doesn't seem to be anything I can do about increasing the hot water pressure enough to be able to run a bath apart from changing the taps to something more suitable for the current pressure it seems?
 
You need low pressure taps to suit the gravity hot water set up
 
To be honest mate. The simple answer that is unless you are going to do it properly anything else is going to be a bit of a bodge. It'll do the job but it's not how it should be
 
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There is seriousl cross contamination going on here, you need to call in a professional plumber, there are water regs being broken here. No an Nrv is not sufficient
 
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Thank you at least I know the way forward now and there are things to be learnt. Thank you aprreciate it!
 

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