I am following the UK traffic management regulation since the early days of this blog (see "DPI Deployments - Part4: UK - Everybody is Doing it !" - here), as the UK ISPs are more transparent in their disclosure (voluntarily or by regulation - see "[UK]: Self Regulation doesn't Satisfy Ofcom; Publishes Minimum Disclosure Level" - here) compared to ISPs in other countries.
On top of all that, Ofcom published a new consumer guide, explaining consumers what is traffic management and exposing ISPs policies. They used the common comparing Broadband Traffic Management to motorways, serving variety of cars and
"With 46 million people in the UK having access to broadband and many using it for data heavy activities such as streaming and downloading, the internet is becoming increasingly busy.To ensure that networks operate efficiently, ISPs can restrict or ration traffic on their networks, or give priority to some types of traffic over others. This is known as ‘traffic management’.
"Each ISP has its own traffic management policy and so when choosing a provider you should check their policy meets your needs. Below you will find links to policies of the largest providers. If your ISP is not on this list, visit your provider’s website or speak to their customer services department: BT, Karoo, Plusnet, Sky, TalkTalk, Virgin Media (National and Cable), O2 (Home broadband and mobile broadband), EE (Handsets, broadband and mobile,broadband), Three, Vodafone."
See "New consumer guide on internet ‘traffic management’" - here.