The now free 5-car IETs could be used on the Cardiff to Portsmouth fast services to help relieve overcrowding and provide a second service an hour between Cardiff and Portsmouth, which would require 8 5-car IETs. 12-13 IETs would be freed from the 350/2s and 387s reshuffle, with an additional 5 coming from the South West with the 175 introduction. Also, this would allow for the North Cotswolds to continuously operate with 10-car IETs to Oxford and then 5-car to Worcester and another 5-car running to Banbury, which would allow for the withdrawal of the every other hour Didcot to Banbury stopper to be replaced by an hourly service instead which improves frequency and reduces overcrowding on Cross Country.