The Avanti services from Edinburgh, Glasgow and Blackpool to London via Birmingham have a timetabled dwell of around 9 minutes at Wolverhampton in the up (southbound) direction. This is in addition to the 5 minute dwell at New Street.
During that dwell, they are overtaken by the following XC Reading/Bournemouth service, meaning that journey planners suggest changing for the XC service if you are heading to New Street, International or Coventry - although there is only a saving of around 5 minutes by doing so.
This is of course the legacy of it being a combination of two formerly separate services, from Scotland to Birmingham and Wolverhampton to Euston.