Hi Amy, Happy New Year to you also. Hope you had a good one?
The use of certification marks you wont find within the ISO standard as these relate to the certification body (in your case ccas). Their rules of use can be found here: https://www.ccas.org.uk/management-systems/use-of-certification-marks
When I reviewed your logo, it is correct, however your certification number (2002/266) could not be seen on the website underneath the logo. You need to ensure that this is shown. I hope this helps?