Hello Steve,
Thank you for taking the time to let us know about your experience.
We are sorry you had trouble with your order.
Imperial PVC pipe is measured in inches. The measurement relates to the nominal bore (the "approximate" bore) of the pipe, and not the outside diameter. This sizing system is used worldwide.
We understand how this system could cause confusion, so we provide information on our website to try and help customers as best as we can before purchase. When measuring Imperial fittings, it is best to measure in Millimetres and check that measurement against our Imperial Pipe Dimension table, which can be found using this link: https://www.plasticpipeshop.co.uk/Inch-Imperial-PVC-Pipe_c_493.html#dimensions
Kind regards,
From the team at Plastic Pipe Shop