A clear view
of website cookies.

What cookies do

Cookies are small files stored by your browser. They can help a website work, remember choices or track how it is used. Different cookies have different purposes.

The public website

Our public website does not set optional analytics or advertising cookies. It uses locally hosted fonts and images and does not embed third-party maps or videos. The calculator runs in your browser and does not send the values you enter to us.

The enquiry form uses a time-limited security token and server-side abuse controls. It does not need an advertising or analytics cookie. Your hosting service or other installed software may use necessary security technologies, which should be reflected in the live website’s cookie information.

WordPress sign-in cookies

WordPress uses necessary cookies when authorised users sign in to manage the website. These relate to authentication and administration, rather than advertising to public visitors.

If optional cookies are introduced

Optional analytics or advertising technologies should only be added with appropriate information and a suitable consent mechanism. You should be able to reject optional cookies as easily as accepting them and change your choice later.

Your browser choices

You can also manage cookies in your browser settings. Blocking necessary cookies may affect functions such as signing in. For more information about cookies, visit the ICO’s guidance ↗.

Last updated: 9 October 2026.