Independent report (Bristol / South East Wales area)

 I am in dispute with the company who provider and fitted my roof, it has started to split with in the first year

I paid with my credit card and they have asked for a “independent report”, as that manufacture of the roof has said that it is “fair wear and tear” (after 11 months?)

As a member of MX5OC can any one help me outWinkWink Bristol / South Wales area or advise me where to go