Quick browse on the BASC policy website info and found this which backs up what Dale has advised
The BASC members’ insurance policy is a policy of ‘first resort’ which means in the event of a claim, the BASC insurance claims team will take on the claim and deal with it, regardless of what other policies you may have in place. We will only seek a contribution from other policies as part of our process in the background, without any delay to the settlement.
However, many of the cheaper membership insurance products that are out there are policies of ‘last resort’, which means if you make a claim on one of them, the policy will not respond until you can prove that you have no other insurance in place that could cover the claim. If you hold household contents insurance, for example, this will almost certainly cover your personal liabilities and would be forced to respond to the claim before your membership cover
The BASC members’ insurance policy is a policy of ‘first resort’ which means in the event of a claim, the BASC insurance claims team will take on the claim and deal with it, regardless of what other policies you may have in place. We will only seek a contribution from other policies as part of our process in the background, without any delay to the settlement.
However, many of the cheaper membership insurance products that are out there are policies of ‘last resort’, which means if you make a claim on one of them, the policy will not respond until you can prove that you have no other insurance in place that could cover the claim. If you hold household contents insurance, for example, this will almost certainly cover your personal liabilities and would be forced to respond to the claim before your membership cover