The Turkish leader is scheduled to meet Queen Elizabeth II and British Prime Minister Theresa May on Tuesday.
Under Erdogan, who survived an attempted coup in July 2016, Turkish authorities have sacked, detained or jailed hundreds of thousands of civil servants, soldiers, journalists and political opponents accused of having ties to suspected coup plotter Fethullah Gulen, or Kurdish militants.
Turkey attaches special importance to cooperation with Great Britain, he said at a briefing before his flight to London.
"Turkey has always defended the stance that issues regarding Iran's nuclear program should be resolved through diplomacy and negotiations and has made intensive efforts in this direction", the ministry said in a press release on its website. He cited British-Turkish cooperation in defense industries as an example for more new ventures.
The Iranian President also pointed out that any new U.S. sanctions against Iran were contrary to global rules and United Nations Security Council Resolution 2231.
Topics include the latest developments in Cyprus, where Turkey and Britain both act as guarantors, and a "joint action plan" for the Middle East, especially Syria, Iraq and Iran.