Users who hold provisional licences are still able to use the short-term product on certain vehicles, so long as they fall between the ages of 17-45 and fit all other requirements.
The supervisor of a learner driver does not require insurance – only the driver themselves do. As long as the supervisor is over 21 and has held their license for at least 3 years, they are fine to supervise. Please remember: the supervisor must also comply with government laws which you can find here – https://www.gov.uk/driving-lessons-learning-to-drive/practising-with-family-or-friends
Having passed a driving test, full license holders have separate requirements from the underwriters. The age range for the short-term product is 19-75 but another requirement is that if you fall between the ages of 19-21, you need to have held your licence for at least a year, with no at-fault claims.
It can take the DVLA a couple of weeks to update the information from their end, so it is best to wait until the the new licence comes through before purchasing another policy.