sorry not so sure I only know it roughly as I never on cable. Gentle_Giant reply have more details about cable/non-cable, it might depends on different case, I think the best to ask your provider (Virgin) or they might reduce a lot to keep you stay with them.
also see this comment from another talk talk thread https://www.hotukdeals.com/comments/permalink/32289043
3 years of cutting signal which they insisted was a problem with the house, it hasnt occurred in over 10 years with BT though, they will just do anything to pass the blame one and insisted it would cost to send a technician to the house to check the line. I wasted hours with their customer service about the missing internet connection, it was impossible to download anything stably. their only suggestions for fixing were to spend more money, the only fix turned out to be finding a company that doesn't have the reputation of a pile of manure. if you need a stable connection at any time of day outside the hours of 5-6am then you need to go with a company not affiliated with talk talk, the cost of time wasted with customer service will never be worth any money you save.
Most ISPs charge a termination fee; and if you are not on a BT line (Sky, Virgin or LLU), and you switch to an ISP that uses BT lines, you will have to pay a connection fee as well; although many of the big 'n nasty ISPs absorb this cost to get your custom. if you are grumbling about £38, you wouldnt want my ISP; my average bill for phone, line and BB is £54; however I do get exemplary service; my average resolution time for a non physical fault is under an hour, and for a physical line fault 2 days. As an example, 2 years ago there was a lot of damage to local lines and cabinets due to storm damage; both mine and my neighbours lines were knocked out. Mine was fixed the day after I reported it by Open Reach; Talk Talk didnt INFORM O.R. of my neighbours fault for a further 10 days - spending the time giving her the run around on their support line. When I needed a new line strung (more storm damage), I got it in 10 days, against BT saying it was impossible in less than 6 weeks.
What sort of premium? If I was to go with Sky Id just have to pay what ever the monthly bill is lol