Before you buy all that try this, turn the stop tap off, loosen the bottom nut and drop 15mm pipe out of iso valve, paste and washer the top nut and nip this onto plastic pipe by hand, making sure its not cross threaded, then connect and nip up bottom nut. Seen loads of these where the angle of the copper pipe forces the iso valve to be cockeyed and causes it to leak. Start the top nut by turning anti-clockwise till it clicks.
I have installed the flexi hose now, it was pretty easy although I couldn't have done it without the help on here.
I decided to stick with the current fill valve and just install the flexi hose, although I will get the fluidmaster fill valve should I need to replace one of them in the future.
I have left some kitchen paper wrapped around the new isolation valve and the fill valve nut and will check later that the paper is still dry.
As an added bonus the water hammer has been much improved since doing this.
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