If the idea of local blackberries for local people rings any kind of bell (positive or negative), you’ll find plenty to think about in this one-person show on the nature of nationalism. Opening with the bagpipes (the Cornish kind) and moving between communal singing, a blistering four-minute history of Cornwall, the etymological roots of the word ‘emmet’ and an actual shared cream tea (yum), Seamas Carey has created a show about Cornwall and Cornish nationalism which resonates far beyond the Tamar.

Inspired by his podcast series The Reason Why, little of his beloved home escapes Carey’s questioning gaze. And it’s remarkably interesting to sit back and watch as his hyper-local references (like how a car’s bumper sticker can change your opinion of the driver’s reversing skills) connect with a typically international Fringe audience.

Where things get muddier are around the nature of the show itself. Is this a lecture? A comedy (as billed)? A sociological experiment? Or simply a place to share thoughts and examine prejudices? The sheer force of Carey’s energy and personality holds everything together, but sometimes only just; the odd veer into didacticism makes it feel just a little niche which is a real pity, given the subject matter.

Help! I Think I’m A Nationalist, Lyceum Theatre, until 27 August, 2.30pm.