Solihull-based intermediary Personal Touch Insurance (PTI) swooped when Prudential changed the terms of its critical illness cover.
PTI struck a deal with Bupa which gets guaranteed rates for its customers based on the information on the Prudential applications.
Strategic development officer Mike Allison said PTI had about 1,000 cases outstanding when the Pru made its changes.
"We're offering them a solution to a problem that was thrown at them through no fault of their own,"he said.
Prudential announced earlier this month it would change conditions on critical illness applications being processed and would no longer guarantee rates.
PTI made headlines in January when Dutch insurer Aegon netted millions for its four founders by buying a 9.99% stake.
The value of the deal was not disclosed, but was believed by analysts to have been worth up to £3m.