GWR Class 800 & 802 units departing Didcot on electric power

On the 16/01/2018, my friend managed to film a GWR Class 800 BMU arriving on diesel power and departing Didcot Parkway on electric power on a London bound passenger service. My friend also managed to film a GWR class 802 BMU on a test run also departing Didcot Parkway on electric power on the same day.