It should be about the diligence process employed by the retailers. If they have taken appropriate steps to make sure the product complies with UK furniture regulations then fine, they have be conned by the manufacturer. Imports from the rogue manufacturer should then be targeted by trading standards in the future. However, if they haven't completed a reasonable amount of due diligence then it would definitely be in the public interest to pursue this legally. What else might they be importing that does not comply with UK/EU regulations; toys, electrical goods, children’s pyjamas or food?
Don't forget the horse meat! It is the UK retailer’s ability to drive down supply costs that is causing manufacturers to cut corners, seek cheaper and sometimes inferior raw materials or even exploit foreign labour markets.
Making a bigger profit at the expense of safety is not and never should be acceptable.