Before Timms would win his second Scotland cap, he was selected to represent Matthew Mullineux's British Isles team on the 1899 tour of Australia. Timms scored two tries in the opening match of the campaign, against Central Southern, but missed the next four games, including the First Test against Australia. Timms regained his place for the sixth game of the tour, and missed only two more games, becoming a regular fixture in the team. After the British lost the First Test match of the tour, and Mullineux made several changes to improve his team for the Second Test. Timms was brought in at centre as replacement for Charles Adamson, and was partnered with Gwyn Nicholls, with whom he would be paired at centre for the remaining three Tests. The British won the last three Tests, with Timms scoring a try in the Third Test at Sydney.