Until the introduction of the Class 800s, DMUs were infrequent visitors the Great Western Mainline between Swindon and Didcot. However, the splitting up of the Class 165 & 166 allocation between London and Bristol has seen increased visits in 2018. 165106 passes Grove on 22 October 2018 with the 5Z84 11:19 Swindon to Didcot Parkway crew training run. The unit had only just gone the other way as the 5Z81 10:13 Reading Traincare Depot to Swindon.