In case you've not yet seen this offer already, kids educational app Highbrow on Sky Q.
Have Sky Q? Highbrow is available for free until 31st March 2021. Let your kids explore ideas, learn and grow with teachers who are musicians, artists and scientists. It’s yours up until 31 March 2021
There’s no need to supply any details and you won’t be auto-enrolled into a subscription when the offer ends.
More info on Highbrow here: Link