He was then called up for the third Test at Durban against the touring England team, opening the innings and scoring 11 and 10. That was not enough for him to retain his place for the remaining games of the series. First-class cricket in South Africa in 1928–29 was restricted to a series of matches around Christmas in Durban, but Siedle took advantage of the match against a weak Border team to hit an unbeaten 212, his highest score to that point, and the innings secured his place on the 1929 tour to England. Test regular Siedle did well in the early first-class matches of the tour to England: in the second county match of the tour, he hit an unbeaten 169 against Leicestershire, taking more than five hours to reach 100 but then adding a further 69 in little more than an hour. Three weeks later he almost repeated the feat by making 168 against Yorkshire including 20 fours in what Wisden Cricketers' Almanack described as "an admirable innings". After that, however, he was forced to retire ill in the match against the Minor Counties and he then missed six of the next seven tour matches, and they included the first two Tests of the five-match series. He returned to fitness in time to be selected for the third Test, but he was not a success, being dismissed for 0 and 14 as England won the match by five wickets. There was no success for him in the remaining Tests in the series, either: he scored 6 and 1 in the fourth match and another 14 in a single innings in the final game. But away from the Tests, Siedle continued to be a regular and reliable scorer, though there were no more centuries. He ended the tour with 1579 runs, the second highest aggregate after Bruce Mitchell, at an average of 35.88, the second highest average after Herbie Taylor. His overall performance earned praise from Wisden: "Siedle, though a failure in the three Test matches in which he took part, was very consistent otherwise and never looked an easy man of whom to dispose. He watched the ball well and had a nice variety of strokes," it wrote. Back in South Africa in the 1929–30 season, Siedle hit the highest score of his career in making an unbeaten 265 for Natal in the Currie Cup first-class match against