Harry Potter star Margolyes is cast as Colin's nan Rose, who has decided to get a job on the tills at Valco.
Dci Banks lead Tompkinson will play Valco's jumped-up new pharmacist, while Carroll joins the show as cheeky know-it-all Harry.
Award-winning stand-up Aisling Bea will also appear in the new series as Charlotte, the hopeless heiress of the man who owns Valco.
Series four of Trollied is coming soon to Sky1.
Watch a clip from the last series of Trollied below: »
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