The Financial Markets Authority is urging eligible investors in the Hanover settlement who have not yet made a claim for their money to do so before Friday 16 February 2018.
In what it says is a final call, the FMA says so far 85% of eligible investors have responded to correspondence and received their money.
"There are around 600 eligible investors who have either returned incomplete information to Deloitte or are yet to make a claim," it says.
"We strongly encourage these eligible investors, or family members of eligible investors, who still need to claim their money, to contact the Hanover distribution team at Deloitte."
The distribution team can be contacted at firstname.lastname@example.org or via the dedicated phone number 0800 426 683.
Deloitte has provided further information on the Hanover finance companies distribution.