Everyone is invited to take on a challenge around the number 100 anytime and anywhere over Captain Tom's birthday weekend. It's so simple.

Think up your 100 challenge. It can be anything you like – from walking 100 metres to baking 100 cakes or writing 100 letters.

Take on your 100 any time between Friday 30 April and Monday 3 May.

Click here to see the fact sheet

If you'd like to take on the challenge and donate to Papworth Trust, you can do so here.