Like many websites, this website places small data files known as cookies on your computer. They cannot be used to identify you personally, but they can remember activities and preferences you have chosen.

If you wish, you can manage cookies by controlling which cookies are saved or by deleting them. How to control cookies (

Below are details of the cookies used on our website.

Performance cookies

These cookies allow us to understand how people use the website, so that we can improve the information provided. No personal data are collected.

Google Analytics performance cookies

Cookie name Purpose Expires
_gaUsed to count visitors to the site.After 2 years
_gatUsed to throttle the request rate (i.e. to limit how often Google's servers are contacted)After 1 minute
_gidUsed to count visitors to the site.After 24 hours

You can opt out of Google Analytics cookies.

Functionality cookies

These cookies record information about choices you've made and allow us to tailor the website to you.

Area of website Cookie name(s) Purpose Expires after
All pagescookieconsent_dismissedTo prevent the cookie information box reappearing after you have closed it.

1 year

Strictly necessary cookies

These cookies enable services you have specifically asked for. Without these cookies some services you have asked for cannot be provided.

These cookies are deleted automatically when you close your browser.

Cookie name(s) Purpose
WSS_KeepSessionAuthenticatedAllows you to view password protected web pages after logging in