//So if the deficit is down how is the debt up?//
The deficit is the annual difference between the nation's income and its expenditure. The debt is how much we owe in total.
So, imagine you have to borrow £1,000 each year to get by. That's your "deficit". After one year you owe £1,000. After two years £2,000. That is your debt. Then you get a pay rise which means you only have to borrow £500 to get by. So your deficit has decreased by £500. But your debt goes up to £2,500 and will continue to increase.
That's how your deficit can reduce but your debt continues to rise.