By Ian Walker

Hastings Group Holdings PLC said Wednesday that it has agreed to a 1.66-billion-pound ($2.17 billion) offer from a newly created consortium comprising Sampo Oyj and Rand Merchant Investment Holdings Ltd.

Under the offer, accepting shareholders of the U.K. insurer will get 250 pence a share in cash, a 16% premium to Tuesday's closing price of 215 pence and a 47% premium to its closing price of 170 pence on July 28 the day before Hastings said it had received the offer approach. Shareholders will also be able to keep the interim dividend of 4.5 pence a share declared Wednesday.

Sampo and RMI currently own or control 196.8 million Hastings shares, or 29.7% of its issued share capital.

Write to Ian Walker at ian.walker@wsj.com