I am a US citizen currently living in the UK, do I need to get a background check done in the US or can I get it done in the UK

I am a US citizen currently living in the UK, do I need to get a background check done in the US or can I get it done in the UK

Because you are US citizen coming with US passport, you have to send your US CBC. However, if you have stayed in UK for more than 2 years, you will be requested to send UK CBC as well.