You should be able to switch from satellite to streaming with Sky. (Sky are gradually phasing out the satellites anyway). You do not need a faster connection, however. Unless you have three kids, all playing online games, at the same time you are trying to stream, the speed you have is perfectly adequate. Sky are just trying to sell you a more expensive package.
What bandwidth is needed for 2 tv on uhd streams?
It seems it's 30 per user
And yes I am BT board and
@SharonW56
Probably nearer 20Mb per device, but Sky are obviously erring on the side of caution. But even so you still meet their criteria.
If they won't sell you their Stream service you can always sign up with Now TV & either use the apps built into a smart TV or buy an Amazon Firestick or Roku device.
SKY are trying to discourage satellite customers from switching to Sky stream due to the large revenue loss. You cannot switch online but if you call them and threaten to leave altogether they will give in and switch you.