GISC has received over 400 complaints against non-standard motor broker Allen & Allen.
The broker, which picked up a major industry award for its broker services last week, is thought to have attracted complaints centring on administration, documentation and pricing.
An industry insider said: "Their reputation on administration is dreadful. What they are going to do in the new FSA environment is anyone's guess."
Because Allen & Allen is not a member of GISC, a spokeswoman for the organisation would not comment about the complaints.
But she did say: "As non-members there is no independent arbitration body for customers to appeal to."
Tony Allen of Allen & Allen responded to the allegations by saying: "We are a big organisation with over 300 staff so there are always going to be some complaints, but compared to our size they are minimal."
Hosted by comedian and actor Tom Allen, 34 Gold, 23 Silver and 22 Bronze awards were handed out across an amazing 34 categories recognising brilliance and innovation right across the breadth of UK general insurance.
