https://www.bing.com/mapsBing maps now has traffic cameras embedded in the traffic layer, you need to turn on traffic and then zoom into the roads where little icons are shown. These cameras can often be useful for North Wales limestone with cameras on the A55, also useful for blackstone/woodhouse with cameras on the M62, also anston/mag lime with the cameras on the M1, finally cameras on the M6 can be used for thorn.
Unfortunately there isn't an app and the desktop site on a mobile is unusable. You can however access the same camera feeds in the highways england and traffic wales apps. These are a pain though as the information isn't shown on a map and you have to know which road/junction you want to look at.
