We are aware of some specific instances within experiment pages where some text is slightly under the required ratio. Examples of this are URL links within the experiment information and the arrows within the booking pages date header. This fails WCAG 2.1 success criteria 1.4.3 (contrast minimum) and 1.4.11 (non-text contrast). This is currently being investigated as part of a website refresh. The booking pages are undergoing a redevelopment and this issue will be addressed as part of that development.