Lloyd's drive to achieve a more favourable tax regime for the London insurance market has been dented by the departure of its senior tax director.

David Clissitt, formerly head of tax and treasury, will leave Lloyd's in the New Year after seven years to join accountant Deloitte in January.

He will be replaced by Juliet Phillips, who has worked alongside Clissitt for the past four years.

Clissitt's appointment as tax partner, with particular focus on non-life insurance, is part of Deloitte's expansion into the insurance tax sector.

He is one of four key appointments, who will focus on the entire insurance industry.

Peter Wright, who will head up the nine-strong team, told Insurance Times: "[Deloitte] believes that as a sector, whether it is

Lloyd's, life insurance, the London market, or general insurance, retail or wholesale, there is a huge opportunity and an awful lot of market activity on the advisory side."

Clissitt will work alongside Andy Todd, who joined on 1 November from Aviva, former UK head of tax at AXA, Cathy Lynch, Liz Punchard, Zurich Financial Service's deputy group tax director and Jess Ridd-Jones, formerly of Legal & General.

Meanwhile, Amlin group operations director, David Harries, has been seconded to Lloyd's for six months to help drive forward business process reform.

A Lloyd's spokesman said: "Business process reform can only be achieved in partnership with the market.

"[David] will be providing advice, direction and support to ensure the successful delivery of our business process objectives."

Harries is a key member of G6, the group of managing agents pushing forward electronic change in the London insurance market.