The problem here is despite there being a contract, the ability to have a working service is not an issue, and any network (like airlines) can turn round and point to external forces outwith their control and they're immune to any action unless they could be proved to be negligent (difficult, but not impossible). Private users pay a reduced price and receive a reduced (or no) service, where commercial users in addition to paying slightly more, get a 'Level of Service Guarantee' which precisely lays down the obligation of both parties and the financial implications of service disruption. These are used are tools to negotiate costs when things go wrong.
In the consumer world, this is seldom agreed, and apart from a few half-hearted attempts are offering compensation, TT stand proud in offering not much, as usually nothing is their fault, it is BT's network and outwith their control. BT Openreach was created to look after all these issues, but I see no benefits is going to TT where all they do is provide billing, and you lose BT's compensation and (probably) faster repair times.
I like to retain as much control as possible, and shun all deals that are simply brands tugging on the coat-tails of another supplier - hence Tesco Mobile or Virgin I've no intention of joining, same goes for telephony. You very often get what you pay for... pay buttons, get monkeys!
Consultation period for complaints. 
