CSCS.uk.com is the only official card application service.
Third party organisations offering CSCS cards and other services are often more expensive and can charge admin fees or other costs. These organisations are not affiliated, associated or approved by CSCS.
If you are paying more than £36 for a card, check thoroughly that you understand what additional services you will receive, if any, and that you are happy to pay for them.
The CITB Health, Safety and Environment test costs £22.50 and should be booked directly through CITB.