, Thank you question and welcome. My name is ***** ***** I will assist you. Insurance companies cannot black list you like this. The only danger is if you are ever asked by another insurer whether you have been denied cover. If they ask this question you are under a good faith obligation to be as honest as possible to insurance companies.
There is not some wide ranging exchange of information following reasons:
1. Personal data is protected by the Data Protection Act 1998;
2. The insurance system would not work if insurers had such an advantage to share information like this.
If you ever have a complaint about your insurer you should contact the Financial Ombudsman -
Can I assist any further? Kind regards AJ