Fitting PRV on cold water bathroom pipe

Joined
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Hi

The set up I had for my hot water before was gravity pumped to 3 bar and cold water on mains. That was for all taps in the house. I also had pressure reduce valve (PRV) fitted for the cold water supply in the bathroom.

I had unvented cylinder installed few months ago. I have the cold water mains pressure at 5 bar but the hot water from cylinder at 3 bar. I am finding the pressure of cold water too high, thermostatic shower mixer taking a while to adjust to hot temperatures. My installer removed the PRV saying I can't have with this new system.
The photo below shows my current installation. can I have PRV where the arrow is, set to 3-3.5 bar? This is where I had it before, it is the cold water supply to bathroom WC, basin, shower and washing machine on ground floor.

TIA
 

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    PRV Location.jpg
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