http://news.bbc.co.uk/1/hi/uk/4425079.stmBritain has imposed a ban on entry visas for young Nigerians aged between 18 and 30 who intend to visit the UK for the first time.
The British High Commission in Nigeria says it cannot deal with the high number of visa applications, which have nearly doubled in the last two years.
The temporary ban will remain in force until next year, while the office is reorganised to improve visa service.
But an official at the Nigerian presidency said it was "very unfair".
"We enjoy a close relationship with the United Kingdom," said Femi Fani-Kayode, special assistant to the Nigerian president on public affairs
"I don't think this is the way to strengthen ties between the two countries."
The visa refusal rate is particularly high in Nigeria, where about 80% of applications from young people are turned down.
Some are rejected because they have forged documents, says the BBC's Anna Borzello in Lagos.
The UK Foreign Office said it will improve the service offered to applicants.