Agnew returned to the role of PC Plum in special CBeebies versions of the seasonal nature programmes Springwatch and the BAFTA award-winning Autumnwatch.
Returning to the stage, Agnew has appeared in many Pantomimes including Peter Pan in Tunbridge Wells he played Smee opposite James Gaddas as Captain Hook.
Agnew appeared in the Christmas Pantomime Sleeping Beauty at Swansea's Grand Theatre between December 2009 and January 2010 starring alongside Malandra Burrows and Helen Fraser.
He has also appeared twice in New Brighton in Aladdin with Dean Sullivan & Kelsey-Beth Crossley and reprised the role of Wishee alongside Bill Ward in 2018/19 season, this time also as Director.
He returned to the Churchill Theatre, Bromley the following Christmas to play Buttons in Cinderella with Matt Lapinskas, Anna Williamson and Jessica Martin.
The 2015/16 Pantomime season saw Agnew starring as Smee in Peter Pan at the Malvern Theatres with Mark Moraghan and Hannah Jane Fox and again in Basingstoke with Gary Turner in 2017.
Agnew's 2019 panto season saw him perform as Muddles and Director at the Pavilion Theatre, Rhyl in Snow White and the Seven Dwarfs with Sue Holderness and Charles Burden.
He appeared in the Pavilion Theatre, Glasgow as Dougal "Donald" Morrison in the hit comedy Rally Roon the Rangers by Ned Sollid.
In 2022, Agnew celebrated Balamory's 20th anniversary and return to BBC iPlayer with television and radio appearances, including This Morning with Julie Wilson Nimmo who played Miss Hoolie in the show.