Paul Remington vice chair of the East of England Ambulance trust thanks Ms Ball for her hard work.
He said: “Maria spent many years leading the ambulance service and I would like to thank her for her dedication and commitment through what have been some challenging times.
"Maria oversaw the formation of this Trust, bringing together three disparate organisations into one service, and its subsequent development."
More top news
Outbreaks of rain will move south east overnight, mostly clearing tomorrow morning. In the afternoon, a mix of sunshine and showers.
The American actress Lyndsay Lohan gets invited to Kettering after she criticised the town for voting to leave the EU.
Many of our MPs have already revealed who they will be backing to become the next Prime Minister.