While Williams maintained a base in London until the end of his life, from 1970 onward he spent large amounts of time working overseas in Jamaica, Florida and, less frequently, Guyana. In February 1970 he travelled to Guyana with a group of CAM artists – including Brathwaite, Harris, Salkey and Sam Selvon – for a Caribbean Writers and Artists Convention that was organised by the Guyanese government as part of the Guyana Republic Celebrations of that year, This was the first time he had returned to Guyana since 1952. and Williams received the national honour of The Golden Arrow of Achievement. In the same year he completed a government-commissioned series of five murals, named "Timehri", at the Cheddi Jagan International Airport. 1970 was also the year in which Williams first travelled to Jamaica. After this initial visit, he spent several months in Jamaica every year and was ultimately appointed Artist-in-Residence at the Olympia Art Centre in Kingston.