Tim Yeo said in a statement today:
It has been a privilege to serve as MP for South Suffolk since 1983. I will continue to work for all my constituents until the General Election next year.
I am immensely grateful to all those Conservative Party members who voted for me to continue as their MP. I now ask them all to campaign for my successor with the same loyalty and dedication they have shown to me.
I will give my full and unqualified support to whoever is chosen as the candidate here in South Suffolk. I wish him or her every success.
More top news
Changes in gait could prove to be an early sign of Parkinson's disease, according to a new study.
Tomorrow a new band of rain will move across mainly western Scotland, further south it will stay bright with some sunny spells.
Paul Cantlie, 80, died from "complications following pneumonia" days after making an emotional plea for his son to be released.