raise income tax for everyone by a few percent
Labour’s costings for the policy in 2019 were approx 20bn. That was to be spent over 10 years. Of course you wouldn’t have to raise such a paltry sum by raising taxes because you’d do what Rachel Reeves is about to do an ‘borrow’ it, but even if you did, some quick chatgpting suggest the rate of tax would have to increase by around 0.2% over 10 years.
including those who already pay £25 per month for internet?
You do realise it was ‘free’ broadband? As in end users wouldn’t have to pay it. For many £25 a month would be more than the extra income tax they would have to pay. It’s a no-brainer.