Information about our use of cookies

This cookie policy should be read in conjunction with our Privacy Policy.

Our website uses cookies to distinguish you from other users of our website. This helps us to provide you with a good experience when you browse our website and also allows us to improve our site. By continuing to browse the site, you are agreeing to our use of cookies.

A cookie is a small file of letters and numbers that we store in your browser, which in turn will store it on the hard drive of your computer if you agree.

We use the following types of cookies:

  • Strictly necessary cookies. These are cookies that are required for the operation of our website. They include, for example, cookies that enable you to log into secure areas of our website, use a shopping cart or make use of e-billing services.
  • Analytical/performance cookies. They allow us to recognise and count the number of visitors and to see how visitors move around our website when they are using it. This helps us to improve the way our website works, for example, by ensuring that users are finding what they are looking for easily.
  • Functionality cookies. These are used to recognise you when you return to our website. This enables us to personalise our content for you, greet you by name and remember your preferences (for example, your choice of language or region).
  • Targeting cookies. These cookies record your visit to our website, the pages you have visited and the links you have followed. We will use this information to make our website and the advertising displayed on it more relevant to your interests. We may also share this information with third parties for this purpose.

Please note that third parties (including, for example, advertising networks and providers of external services like web traffic analysis services) may also use cookies, over which we have no control. These cookies are likely to be analytical/performance cookies or targeting cookies.

The cookies we use on are:

Name Type Purpose
__cfduid Performance We use a service called CloudFlare to serve you pages from our site more quickly. This cookie indicates to this service that you have been ‘whitelisted’ to be allowed to bypass certain extra security controls.
Analytical We use a service called Google Analytics to collect data about the number of visits to pages of our site, and the journey of visitors through the site. This helps us to optimise the site design.
Strictly necessary On the cookbook part of our site we use a service called GitBook to manage the content. These cookies are set if you are logged into Gitbook and allow them to manage access to their services.
We use a service called TrackDuck to enable users to report errors on our website. They in turn use Amazon Web Services to host their system. The AWSALB cookie allows them to deliver their service seamlessly from multiple services using a load balancer, so the cookie simply records which server cluster is serving you.
hjIncludedInSample Analytical We use a service called HotJar to collect data about the journey of visitors through our sites and the areas of the site that receive attention. This helps us to optimise the site design.

Our legacy blog is hosted on and subject to the privacy and cookie policy of A Medium Corporation.

You can block cookies by activating the setting on your browser that allows you to refuse the setting of all or some cookies. However, if you use your browser settings to block all cookies (including essential cookies) you may not be able to access all or parts of our site.