Yes we could have afforded it and no, we decided not to.
Academically, the private doesn't perform as well as primary. Both children test in the top 1% nationally so haven't suffered academically. That said, we've had to push school in that respect. We are probably the parents the labour government wanted to attract to state schools - pushy and invested. We've pushed for extra language tuition (paid for) as an after school club and another like minded parent now runs the school chess club. When our kids attend chess comps, they are almost always with private schools.
Sports facilities are better at private. However we just pay for our children to access sports clubs at the private school separately.
Music is not good at either state or primary. But we pay for private music lessons across 3 instruments and the teachers come here to home or attend school in a separate arrangement (just for DC).
They also have separate language tuition as I think MFL in state is poor.
Basically, some of the money we would have spent at private, we spend on extra curricular.
It's wholly dependent on the schools and area. Both children will attend state secondary. Working in law, I now see a trend to employ state school graduates and I think some universities favour admissions from state kids over private.