I've paid £360 for 2 weeks holiday club for 2 kids (7 and 4 year old) but shorter days (9-3.30). I've done the shorter days as it's a sports/activity club and I don't think my 4 year old would cope with a full day. My mum will be helping with some pick ups. I got an early bird discount as I booked a month or so ago. That doesn't include food, I send lunch and snacks.
Generally I use a combination of annual leave (I'm lucky to get a generous amount), their dad's annual leave, holiday club and grandparents. This year they're doing 2 weeks in holiday club, then i'm taking 2 weeks annual leave, then their dad (we are separated) is taking 2 weeks annual leave. As the kids get older I'll probably use more holiday clubs and less grandparent care, as grandparents not getting any younger, but also my eldest might get to the point of being able to occupy himself at home as I wfh.
I use childcare vouchers to pay for it, as I've been using them since 2017, I pay out £75 a month from my salary. I don't miss it because I haven't had it for so long!
The guardian article says £900 for 6 weeks which works out at £30 a day, not bad if that's 9-5.