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This website uses cookies to distinguish you from other users of our website.

What is a Cookie?

A cookie is a small file of letters and numbers which asks permission to be placed onto your computer's hard drive. Once you have accepted a cookie the file is added to the hard drive of your computer. Cookies help analyse web traffic and let web applications respond to you as an individual. Web applications can tailor their operations to your needs, likes and dislikes by gathering and remembering information about your preferences.

Overall, cookies help us provide you with a better browsing experience, by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.

How we use Cookies

OPAL implements the following type of cookies in our website:

Strictly necessary cookies

These cookies are essential in order to enable you to move around the website and use its features, such as accessing secure areas of the website.

Performance cookies

These cookies collect information about how visitors use a website, for instance which pages visitors go to most often, and if they get error messages from web pages. These cookies don't collect information that identifies a visitor. All information these cookies collect is aggregated and therefore anonymous. It is only used to improve how a website works.

We also use a common website analytics tool called Google Analytics which uses cookies similar to performance cookies, which gather and review analytic data such as number of site visits, average session duration, referral sources, devices used to access the website and browsers used to access the website.

Further information on Google Analytics can be found at

Functionality cookies

These cookies allow the website to remember choices you make (such as your user name, language or the region you are in) and provide enhanced, more personal features.

How to control Cookies

You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer.

Disabling or blocking may prevent you from taking full advantage of websites, including ours.

When deleting cookies, please be aware that cookies that are already stored on your computer will not be affected. For that reason, you might want to delete the cookies already stored on your computer before deleting cookies on your browser.