Have you contacted 111 first?
If you are not sure if you need urgent care, but your condition is not serious or life threatening, you can use 111.nhs.uk or call 111 including out of hours.
Live Waiting Times of Walk in Centres:
https://www.cornwallft.nhs.uk/miu-waiting-times/
Before contacting the Surgery, please take a look at the NHS self-help guide.