The Conservative Party will not be able to completely detoxify its brand in the eyes of ethnic minority voters in time for next year's general election, a prominent party MP has said.

Adam Afriyie, once touted as a future Tory leader, admitted that even if Prime Minister David Cameron "does everything perfectly" in the run up to the 2015 General Election, the party's lack of support among minorities will persist.

But Mr Afriyie, who became the first black Conservative MP in 2005, said the party would be making a mistake if it changed its policies to suit individual groups in a "political gamble" for more popularity.

He told BBC Radio 4's The World At One: "I don't think it's right that we change policies on the basis of some political gamble that it may somehow make us more popular, I think that would be a mistake. And that our policy doesn't pick out individual groups for special treatment as though they are somehow hapless and helpless."

Asked if the Tory brand had been detoxified enough, he replied: "No. But I think it's capable of being detoxified but it's not something that we're going to solve by the next general election even if the Prime Minister does everything perfectly, the problem is still going to be there at the next general election, it's just going to be reduced a bit."

His Conservative colleague Gavin Barwell said the party must change the mindsets of minority voters who look at the Tories' track record and think the party is not for them.

Failure to do so would pose an existential threat to the party, he added.

Mr Barwell told the programme: "If you look back in the 1960s, the 1970s, the 1980s, the Conservatives probably gave the impression that it didn't really welcome people coming to live in this country and people responded to that and have seen the Conservative Party as therefore not for them.

"The underlying values that the various minority communities in this countries have are often very strongly conservative. So there's huge potential there if it's something we devote some real effort to.

"If we don't crack this problem it poses an existential threat to the Conservative Party."

The Croydon MP said his constituency illustrated the problems felt by certain communities and called on the Tories to address them.

He said: "But it's also true that particular parts of the country or particular ethnic communities might have niche issues that affect them particularly and stop and search is a really good example of that.

"I see in my constituency a real difficulty in the relationship between the community and the police. By addressing it we show that we understand what the concerns in that community are."