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I'm guessing they're recommending new boards so they don't have to worry about damaging the old ones,makes things easier for the fitter so unless they are period skirting it shouldn't make a lot of difference, if its a flooding floor your having fitted then skirting should really come off, (its quicker to fit when you know you can just rip off the old shirting and bin it), the price of the new skirting is probably less than their time carefully removing old and refitting..hope this helps good luck..
Yes.
Because who wants ornate shit when you can have low height plain MDF skirting.