British Prime Minister David Cameron has described last May's State visit to Ireland by Queen Elizabeth II as "a game changer", saying it put the relationship between the countries "into a massive new perspective".

Mr Cameron made his comments during an interview for the documentary 'The Queen's Speech', due to be screened on RTÉ One at 9.30pm tonight.

In the programme, Taoiseach Enda Kenny said that he believes that, after an appropriate lapse of time, an invitation from Buckingham Palace to the President to pay a first official state visit to Britain will come.

Mr Kenny said he is quite sure that President Michael D Higgins, with his long experience of interaction with Britain, would love to participate.

Mr Cameron, described the prospect of a state visit to Britain by the President as "a great idea".

He said the timing of any such invitation will always remain a matter for Buckingham Palace but that he hopes it is something that happens while he is prime minister.