The commission said that the UK was already compiling a list of perpetrators, and would prevent them from obtaining visas or imposing sanctions under the country's human rights laws.
The high commission's statement, released on Wednesday read: "We can confirm that we are collating relevant information with a view to taking action against some individuals."
The high commission, which said it deployed observers in six states, noted, “There were notable points of concern. Members of our observation mission personally observed violence, and voter suppression in numerous voting locations.
"We witnessed and received credible reports from other observer missions and civil society organizations of vote buying and voter intimidation, the destruction and hijacking of election materials and the general disruption of the process in numerous states including Lagos, Enugu and Rivers.
“In addition, we observed incidents of harassment of journalists. Freedom of speech and a free press is crucial for a healthy democracy, and journalists must be able to go about their work without being threatened.
“The UK is concerned by the use of inflammatory ethnoreligious language by some public and political figures. We call on all leaders not just to distance themselves from this kind of language, but to prevent those who speak on their behalf from doing so in this way.
“It is a testament to their commitment to democracy that many Nigerians were prepared to vote despite being faced with intimidation and hostility.”
On the other hand, the commission praised the Independent National Electoral Commission for its improved performance during the March 18 governorship and state Houses of Assembly elections.
