Uno has BT line and is £2 / month cheaper than Pulse8 as you have their broadband.
It would be easier and cheaper to have all with UNO.
Even more so if one was willing to take a one year contract for uno's BTw line rental. Not sure what might happen though if one were to migrate a one month minimum term broadband service away during that year - perhaps Matt (at uno) might pick this possible issue up and comment....