Openreach now sell broadband without a PSTN landline.
On FTTC it's called SOGEA and on G.Fast it is called SOGFast.
However that does not mean you can automatically take out broadband without a landline from any provider.
It's entirely up to the ISP what they wish to sell.
For example Sky do not sell broadband without bundling voice with it. Sky purchase SOGEA from Openreach and bundle a voice package with it using VOIP.
BT do the same thing. They purchase SOGEA and add VOIP on top. They call their VOIP "Digital Voice".
BT do offer a broadband only option now though. It's usually the exact same price as their broadband with Digital Voice though.
t's just that on Uno's website it says:
Active phone line required for entire service duration for copper services
That sounds like Uno don't offer standalone broadband.
Broadband is cheaper when you take WLR (Wholesale line rental).
At the moment your broadband with Uno is discounted because you pay another provider line rental.
If Uno does have a SOGEA offering it would be dearer than you pay them now.