Hi my 2005 2.7L Geist Phantom motorhome is plated at 3850kgs, though the log book just shows it as PLG with no recorded weights at all so I have been paying about £260 road tax. Should it be recorded as PHGV and £165 road tax? If so I'm not so sure that I have a certificate to show this, so guess I would need to get one? I assume that this change would not affect insurance at all? Could I claim the tax overpayments back?