To enable this service to function, we sometimes place small data files on your computer. These are known as cookies.

To learn more about cookies and how to manage them, visit Or please read on to find out more about how and where we use cookies.

How we use cookies

This service uses essential cookies in some places – we've listed each of them explicitly in a table below with more details about why we use them and how long they will last.

These essential cookies are used for site navigation and session management, and this service may not function correctly without them. They are used only to help you navigate through the site and to view and fill in consultations.

This service may use non-essential cookies in some places. These non-essential cookies are not required to make the service function correctly. If any non-essential cookies are used in this service, you will find them listed below.

Non-essential cookies

We use Google Analytics to help us understand how users engage with our website. They also allow us to see which features are most popular and the volumes of usage.  These cookies don’t collect personal information, however when using this website, you consent to the processing of anonymous data such as the type of device used to access the website.

You may refuse the use of cookies by selecting the appropriate settings on your browser; however this may reduce the functionality of the site.

A list of non-essential cookies is listed in the table below.

Cookie name

Typical content



Randomly generated number

2 years


Randomly generated number

30 minutes


Randomly generated number

 Until end of the session


Randomly generated number + info on how the site was reached (e.g. directly or via a link, organic search or paid search)

6 months


Randomly generated number

24 months

View Google Analytics privacy policy


To opt out of being tracked by Google Analytics across all websites, please visit