In 1973, at the age of 29, Walker became managing director of, and acquired a major shareholding in, W. E Guiton & Co. Ltd., the parent company of the Jersey Evening Post, the Island's only daily newspaper.

The case was settled out of court, with the two paying Walker's legal and other costs and taking out a full page advertisement in the local paper to apologise unreservedly for their actions.

When Walker left office Jersey had assumed responsibility for its own international affairs, previously undertaken by the United Kingdom Government, negotiated a number of Tax Information Exchange Agreements with EU and OECD member states, introduced a new form of indirect taxation, together with a new co-ordinated income support scheme for the less well-off, and Jersey had a balanced budget, no debt and substantial cash reserves.

Walker made it clear that his Council of Ministers would ensure that anyone who had been guilty of child abuse in that investigation would be brought to justice and that a fully independent public enquiry, chaired by a leading U.K. lawyer, would be established.

He also acts as trustee for Sanctuary House, a charitable organisation that seeks to assist disadvantaged and homeless men get their lives back on track, and is a churchwarden at St Brelade's Church.