Shaun Griffiths asked via email: Why was the criteria for PIP (Personal Independence Payment) changed from 50 metres to 20 metres?
David Cameron's response: We want to make sure that support goes to those who need it the most.
Higher rate mobility payments are meant for the most disabled - people unable to walk or virtually unable to walk. We asked experts for their views - and we've now decided that 20 metres is a fair criteria to set.
But it’s not a cast iron limit. If you can move further than 20 metres but can't do it safely, reliably, repeatedly, or in a reasonable time period - then you can still qualify for the enhanced rate payments.
I know how difficult some of our changes to the welfare system are. But they're the right thing to do. Under Labour, people were often put on Disability Living Allowance for life without any regular assessment to see if their condition had changed.
The new system will include a new face-to-face assessment and regular reviews. Because for us, it's about looking at people as individuals, not labelling them by their condition.
Ross Casement asked via email: At a time when you are slashing benefits to poor families and calling for austerity, how can you justify £10 million for Margaret Thatcher’s funeral?
David Cameron's response: Regardless of your views on Mrs Thatcher, we can all agree that she was a towering figure in our history: the first woman Prime Minister; a statesman who helped end the Cold War, won the Falklands war and put our country back on the map.
I believe it’s right that we should mark those exceptional achievements with a proper occasion.