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Yep T&G, the secret fix variety, designed to allow fixings to be easily covered by the next board. https://www.southgatetimber.co.uk/products/details/Western_Red_Cedar_Channel_GrooveST6
How to fix the battens though? I want to avoid making holes in the cladding. Maybe masking tape and super glue could work, although it could be disastrous if it failed mid cut.