Conservative Party leader David Cameron is to star in a film promoting Birmingham's economic renaissance.

Mr Cameron was in Balsall Heath yesterday looking at examples of inner city renewal, in a visit described as private by Conservative Central Office.

But secretly, later in the day, Mr Cameron recorded his part in a video that will be shown to hundreds of the world's top regeneration experts at the MIPIM property fair in the South of France next month.

He agreed to take part following a request from Mike Whitby, the Conservative leader of Birmingham City Council.

The decision is being seen as further proof of strengthened support from the Conservative Party for Birmingham's Tory-Liberal Democrat council coalition. Mr Cameron decided upon becoming party leader to hold his first shadow Cabinet meeting in Birmingham and has visited the city again since then.

The film, which is being produced by the council promotional arm Marketing Birmingham, will present Birmingham as a first class place to do business.

Coun Whitby (Con Harborne) said: "The film will be premiered at MIPIM before an audience of the most influential property experts in the world. These are the real movers and shakers who make things happen and we in Birmingham are reaching out to them in a very positive way.

"Mr Cameron will talk about the vitality of the city and the opportunities for regeneration.

"We also asked the Prime Minister if he would like to take part, but we haven't yet had a reply."