He returned to the United Kingdom in 1982 following the seizure of power in the country by the North Korean funded ZANU-PF organisation led by Robert Mugabe.

[3] In the Rhodesia general election of 1974, he gained the seat of Bulawayo North as a Rhodesian Front candidate, polling 93.4% of the vote among the electorate.

[10] On 29 September 1986, Walker was the guest-of-honour at a Conservative Monday Club Foreign Affairs Committee Dinner at Bailey's Hotel, Gloucester Road, South Kensington, chaired by Richard Stallabrass, who had previously served in Rhodesia.

[12] Walker was introduced as an Ordinary Member onto the Grand Council of the International Monarchist League on 14 March 1990 by Gregory Lauder-Frost (seconded by Lord Sudeley).

[11] He administered the International Monarchist League, the Monday Club, and other business activities from an office at Bishop's Stortford, Hertfordshire, and resided in the town until his death in January 2024.