I wouldn't recommend using Tully's. They are very slow at getting anything done and are pretty rude when you go into see them or try to phone them. It took them almost a month to just ask our landlady whether we could have a sky aerial fitted, they just kept forgetting and appologising. Every issue took far too long to sort out and they would only ever do the bare minimum.
I've spoken to many people who have rented with Tully's and I'm yet to hear a good word.