Can poor cold water flow to my shower, which is gravity fed from a tank in the loft, be improved by means of a pump. If so could you estimate the likely cost?

Hi jacksyl and welcome to The Plumbing Page at ANHD.com.
Is all your cold water gravity fed or just the shower?

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an poor cold water flow to my shower, which is gravity fed from a tank in the loft, be improved by means of a pump

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Sure it can! You treat the tank just like a well with a small booster pump, a check valve and a small bladder tank. To estimate the cost I'd need much more information then you've provided. Get three estimates and go with the one you're most comfortable with. Good luck, Tom