There is disruption to the Cross Country train service that runs between Cardiff Central and Nottingham from August 17 and 26 due to planned rail works just north of Birmingham (primarily linked to work necessary for HS2).
According to Network Rail the routes affected include services between:
Birmingham New Street and Leicester, Peterborough, Cambridge and Stansted Airport.
Cardiff Central and Birmingham New Street to Nottingham.
Scotland, the North East to Birmingham New Street and the South West.
See this link:
https://www.networkrailmediacentre.co.uk/news/major-engineering-work-to-affect-crosscountry-journeys-next-month