#1 if on mobile/ tablet - likelihood is its a browser issue so please try another browser; google chrome, firefox, Samsung internet etc. Also sometimes easy just to visit www.mapesmillport.co.uk then follow the webcam link to see if you can get in that way. 
#2 if you do not want to or are unable to do #1 try updating the browser you are using through the app store.
#3 if all of this fails download firefox or try another way to access the internet.