In the 1960–61 season, Palace achieved promotion to the third tier and Summersby was ever present, making 46 appearances, scoring 25 goals, which is still (as of September 2014) the fourth highest seasonal goals total in Crystal Palace Post-War history. Only Byrne the same season (30), Andrew Johnson in 2003–04 (28) and Glenn Murray in 2012–13 (30) have scored more goals. The next season, Summersby made 42 appearances, scoring eight times, but in 1962–63 only appeared 17 times (in the first half of the season) and scored twice. At the end of that season, in May 1963, he transferred to Portsmouth, rejoining former Palace manager George Smith. However, after only 12 games for Portsmouth, over two seasons, Summersby moved on to non–league football with Chelmsford City and later Hillingdon Borough.
