How many Ghanians are there in the UK?

At least 92,000.

There are an estimated 92,000 Ghana-born persons in the United Kingdom from January to December 2008. This is according to statistics from the British Office for National Statistics. A 2008 book by Arthur John, The African Diaspora in Europe and the United States, estimates that there are 1.5 million registered with the UK Ghanian High Commission.