take it out, clean it and the inside of the seat tube, apply grip paste, torque correctly. It shouldnt be greased (if it is that's why it's slipping)
If it still slips measure the post and seatube with calipers to determine where the issue lies
Thank you for the steer.
Took it out and can see evidence of the slipping ... it looks like the lacquer layer on the seatpost has been scraped off at various heights. Reckon it's ok to carry on with?
@exteroceptive started
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take it out, clean it and the inside of the seat tube, apply grip paste, torque correctly. It shouldnt be greased (if it is that's why it's slipping)
If it still slips measure the post and seatube with calipers to determine where the issue lies