Thanks Rose,
I’ve checked the Woocommerce Customiser and the images are set to 750px for Product Single page and 600 for Catalogue images (all product images were uploaded at 750 x 750), however when looking at the single product page image with code inspector, the main image is showing as 68 x 68. This seems to be coming from class=owl-wrapper-outer
https://werone.co/eng/product/california-poppy-extract-vcaps
Many Thanks
Ky