Northampton MP Brian Binley has announced he will be stepping down at the next election.
The politician, who revealed he was battling cancer earlier this year, said the decision was not linked to the illness and he is now in remission.
But he said at the age of 73, and after nearly 10 years representing the Northampton South constituency, it was time for him to step aside.
Asked about recent speculation that he might join UKIP he said "I will remain Conservative till my dying day".
More top news
Wisbech in Cambridgeshire has been described as one of Britain's most segregated towns. We returned there to gauge reaction to the vote.
ITV News Anglia looks back on a night of drama as the East plays a key role in Britain's exit from the EU.
We look at the implications of the EU referendum result on various aspects of life in Britain.