Trading Standards is normally a section of your Local Authority. So you should be able to find out from where your Local Council is now operating.
Did you receive a copy of the report from the 'Independent Assessor' who, in effect, was acting on behalf of the firm from whom you purchased the furniture.
I think it's an attempt by the firm to dodge out of a legal liability. Trading Standards should be able to advise you on the issue concerned and might even pursue matters on your behalf, without it costing you anything.
Hans.