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Information we collect - Cookies


When we provide services, we want to make them easy, useful and reliable. Where services are delivered on the internet, this sometimes involves placing small amounts of information on your device, for example, computer or mobile phone. These include small files known as cookies. They cannot be used to identify you personally.

These pieces of information are used to improve services for you through, for example:

  • enabling a service to recognise your device so you don't have to give the same information several times during one task
  • recognising that you may already have given a username and password so you don't need to do it for every web page requested
  • measuring how many people are using services, so they can be made easier to use and there's enough capacity to ensure they are fast
  • recognising which people are visiting our web pages through social media sites, to make it possible to use targeted advertising

You can manage these small files yourself and learn more about them through "Internet browser cookies - what they are and how to manage them"

If you'd like to learn how to remove cookies set on your device, visit 'Our use of cookies'

Picture Library

We use cookies in the Picture Library to store your lightbox for your next visit. We do not collect any information about you using cookies.

Cookie Typical content Duration
MyLightbox   2 months

Tree Alert

Our Tree Alert application uses session cookies. These are stored for the duration of the session, and are used to associate the servers session with the connected user.

Cookie Name: _ga
Duration: 2 years
Purpose: To distinguish users

Cookie Name: _gat
Duration: 10 minutes
Purpose: Used to throttle request rate.

Google Analytics

Our website uses Google Analytics, a web analytics service provided by Google, Inc. (“Google”). Google Analytics uses cookies -text files placed on your computer, to help the website analyse how users use the site. The information generated by the cookie about your use of the website (including your IP address) will be transmitted to and stored by Google on servers in the United States. Google uses this information to evaluate your use of the website, compiling reports on website activity for website operators and providing other services relating to website activity and internet use. Google may transfer this information to third parties where required to do so by law, or where such third parties process the information on Google's behalf. Google will not associate your IP address with any other data held by Google.

By using this website, you consent to the processing of data about you by Google in the manner and for the purposes set out above.

You may refuse the use of cookies by selecting the appropriate settings on your browser, however please note that if you do this you may not be able to use the full functionality of this website.  We follow the ICO privacy and electronic communication regulations.

Google Analytics sets cookies to help us accurately estimate the number of visitors to the website and volumes of usage. This to ensure that the service is available when you want it and fast.

Cookie Typical content Duration
_utma randomly generated number 2 years
_utmb randomly generated number 30 minutes
_utmc randomly generated number session
_utmz randomly generated number + info on how the site was reached (e.g. directly or via a link, organic search or paid search) 6 months

For further details on the cookies set by Google Analytics, please refer to the Google Code website.

Google Maps

Cookie Typical content Duration
PREF   2 years
NID   6 months
SNID   6 months

Third party cookies - Facebook

Cookie Typical content Duration
datr   2 years
lsd   session
reg_fb_gate   session
reg_fb_ref   session
act   session
csm   session
lu   2 years
sub   session
locale   1 week
p   session
c_user   session
s   session
xs   session
presence   session

Third party cookies - Twitter

Cookie Typical content Duration
guest_id   2 years
k   1 week
_twitter_sess   session

Third party cookies - Flickr

Cookie Typical content Duration
B   2 years
Bx   1 week

How to control and delete cookies

We will not use cookies to collect personnally identifiable information about you.

However, if you wish to restrict or block the cookies which are set by our website, or indeed any other website, you can do this through your browser settings. The 'Help' section within your browser should tell you how.

Alternatively you may wish to visit which contains comprehensive information on how to do this on a wide variety of browsers. You will also find details on how to delete cookies from your machine as well as more general information about cookies.

Please be aware that restricting cookies may impact on the functionality of our website.

If you wish to view your cookie code, just click on a cookie to open it. You'll see a short string of text and numbers. These numbers are your identification card, which can only be seen by the server that gave you the cookie. To do this on the browser of your mobile phone you may need to refer to your handset manual.

To opt-out of third parties collecting any data regarding your interaction on our website, please refer to their website for further information.

Last updated: 11th July 2017