Andrew Porter Plumbing and Heating | Gas Safe Plumbers & Central Heating Engineers in Knaresborough & Harrogate. Professional Plumbing and Heating Services in Harrogate, Knaresborough, and the Local Area. I am based in Knaresborough and cover surrounding areas including Harrogate, Wetherby, Ripon, Boroughbridge and Pateley Bridge. Andrew Porter Plumbing