Yes. As the NHS are not giving out free Covid-19 test to those without symptoms, flyers are now look for private tests kit. Additionally, the downloadable report included with the coronavirus test kit can be used as a fit to fly certificate. However, please speak to your airline and travel destination for more specific fit to fly requirements.
For more information regarding the new fit to fly certificate rules during Covid-19, please see:
> Fit to Fly COVID-19 Tests: Everything you need to know