London has outstanding concerns about Mugabe's win in Zimbabwe Zimbabwe Prime Minister Morgan Tsvangirai and chief opposition to President Robert Mugabe in 2008 file photo. Great Britain is calling for an investigation into the recent election which Tsvangirai has called a "fraud." UPI File Photo/Eco Clement LONDON, Aug. 19 (UPI) -- The British government said it was calling on its South African counterparts to take a close look at electoral irregularities in recent elections in Zimbabwe. Election officials said the majority of the voters who took part in an early August election cast their ballots in favor of Robert Mugabe, in office since the 1980s. British Minister for Africa Mark Simmonds said his government was frustrated with political freedoms in Zimbabwe. "We believe it is essential that all allegations of electoral violations are thoroughly and independently investigated if a process is to be credible," he said in a statement Saturday. Malawi hosts a weekend summit for members of the South African Development Community. Simmonds said the regional bloc should take a close look at the political environment in Zimbabwe during their meeting. "I hope that SADC will look carefully at the electoral irregularities and continue to call for Zimbabwe Electoral Commission to release information, particularly the voters' roll," he said. These irregularities seriously call into question the credibility of the elections. Zimbabwean monitors said they observed some irregularities in terms of voter participation, though the African Union generally endorsed the elections.