Amlin director John Mumford and the active underwriter of syndicate 902, Adrian Walker, have suddenly resigned their posts following the Lloyd's insurer's decision to radically change its business.

Munford was head of Harvey Bowring, one of Amlin's composite divisions, which used to write a wide-ranging book including excess of loss, non-marine, aviation and marine cover.

Harvey Bowring will focus on international commercial property, liability insurance and reinsurance and accident and health under the new structure.

Chief executive Charles Philipps said: “Whenever you have got change, you have to make some difficult decisions.”

Along with Mumford, active underwriter Adrian Walker has also quit the group. The syndicate, 902, writes cargo, hull, property, marine liability, and other marine related business.

Amlin has implemented the strategy to impose tighter structures for underwriting both primary and reinsurance business throughout its divisions.

Coles becomes Amlin's specialist London market marine insurance division and will incorporate both the Walker and Coles businesses.

Harvey Bowring's aviation business will be passed to a division within the group that will focus on all types of aviation cover. Amlin Insurance Services will focus exclusively on UK motor, property and liability insurances.

“What is important is that everybody buys into the strategy and direction of the company and you don't always get 100% agreement, which is fine,” Philipps said. “We had two lead underwriters of marine business and you only want one. I hope both Adrian and John make a success of their careers in new pastures.

“This reorganisation gives Amlin an enhanced and strategically-focused presence in our markets, and brings with it business advantages,” he said.