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John Gordon Sinclair (b. 1962) is a Scottish-born actor who played P.K., the Principal Keeper of the Lighthouse, in the UK version of Fraggle Rock. He joined in the third season due to the death of Fulton MacKay.
Sinclair starred in the 1981 film Gregory's Girl and is well known in the UK for his appearances in a popular series of TV adverts for Tesco's supermarkets, as Gavin, who with wife Kate (Jane Horrocks), serves as foil to the relentless Dotty (Prunella Scales).