Here are some FREE online educational resources that can be accessed at any time, but particularly in the event of school closure:

Little Learners YouTube Channel
https://www.youtube.com/channel/UCraBbapvgSgtvV9_pJ9O0OQ

A variety of content including phonics videos and learning at home ideas.

Khan Academy
https://www.khanacademy.org

Especially good for maths and computing for all ages but other subjects at Secondary level. Note this uses the U.S. grade system but it's mostly common material.

BBC Learning
https://www.bbc.co.uk/bitesize

This site is old and no longer updated and yet there's so much still available, from language learning to BBC Bitesize for revision. No TV licence required except for content on BBC iPlayer.

Futurelearn
https://www.futurelearn.com

Free to access 100s of courses, only pay to upgrade if you need a certificate in your name (own account from age 14+ but younger learners can use a parent account).

Blockly
https://blockly.games

Learn computer programming skills - fun and free.

Scratch
https://scratch.mit.edu/

Creative computer programming

Ted Ed
https://ed.ted.com

All sorts of engaging educational videos

National Geographic Kids
https://www.natgeokids.com/uk/

Activities and quizzes for younger kids.

Duolingo
https://www.duolingo.com

Learn languages for free. Web or app.

Mystery Science
https://mysteryscience.com

Free science lessons

The Kids Should See This
https://thekidshouldseethis.com

Wide range of cool educational videos

Crash Course
https://thecrashcourse.com

You Tube videos on many subjects

Crash Course Kids
https://m.youtube.com/user/crashcoursekids

As above for a younger audience

Crest Awards
https://www.crestawards.org

Science awards you can complete from home.

iDEA Awards
https://idea.org.uk

Digital enterprise award scheme you can complete online.

Paw Print Badges
https://www.pawprintbadges.co.uk

Free challenge packs and other downloads. Many activities can be completed indoors. Badges cost but are optional.

Tinkercad
https://www.tinkercad.com

All kinds of making.

Prodigy Maths
https://www.prodigygame.com

Is in U.S. grades, but good for UK Primary age.

Cbeebies Radio
https://www.bbc.co.uk/cbeebies/radio

Listening activities for the younger ones.

Nature Detectives
https://naturedetectives.woodlandtrust.org.uk/naturedetectives/

A lot of these can be done in a garden, or if you can get to a remote forest location!

British Council
https://www.britishcouncil.org/school-resources/find

Resources for English language learning

Oxford Owl for Home
https://www.oxfordowl.co.uk/for-home/

Lots of free resources for Primary age

Big History Project
https://bhp-public.oerproject.com/

Aimed at Secondary age. Multi disciplinary activities.

Geography Games
https://world-geography-games.com/world.html

Geography gaming!

Blue Peter Badges
https://www.bbc.co.uk/cbbc/joinin/about-blue-peter-badges

If you have a stamp and a nearby post box.

The Artful Parent
https://www.facebook.com/artfulparent/

Good, free art activities 

Red Ted Art
https://www.redtedart.com

Easy arts and crafts for little ones

The Imagination Tree
https://theimaginationtree.com/

Creative art and craft activities for the very youngest.

Toy Theater
https://toytheater.com/

Educational online games

DK Find Out
https://learning.dk.com/uk

Activities and quizzes

Twinkl
https://www.twinkl.co.uk

This is more for printouts, and usually at a fee, but they are a number of free resources available.