The ORR are conducting an inquiry into the disruption following the May 2018 timetable revisions.
http://orr.gov.uk/rail/consumers/inquiry-into-may-2018-network-disruption
There is a public survey which can be completed, the deadling for this is 31st July
https://www.surveymonkey.co.uk/r/3TPYWHV
There will be an interim report in September with full recomendations by the end of the year.