Question Time: Can I back-claim Child Benefit? Change broadband before April? Why does my 7% regular saver only pay 4%?

It's a geek edition of our Question Time podcast! This week Martin Lewis gives you answers on your questions asking him anything and everything, including: should I wait until April to change my broadband to avoid the price hikes? Can I back-claim child benefit, now I know I’m eligible? Why did my…