Self Employment income from foreign source

I am a US resident and do freelancing work for several companies and file a Schedule C.  One such company is located in the UK and pays me in British Pounds, which I convert to US Dollars through my PayPal account.  I of course report the income from the UK company as income on my schedule C, however, do I need to report that income to the UK as well?  As mentioned, I am a US resident, never physically working in the UK.  I am not an employee of this company, I only do freelancing work for them as an independent contractor.  They do not report the money they pay me as any sort of wages.  Thanks for any advice!