No insurer or intermediary may in connection with any transaction relating to a policy require, permit or allow a policyholder, potential policyholder, member of a group scheme or potential member of a group scheme or claimant or potential claimant to sign any blank or partially completed form necessary for the purpose of the transaction, where another person will be required, permitted or allowed to fill in other required detail, or conclude any such transaction where any such signing and providing of detail have occurred.