Traineeship

A Government skills development work programme for 16-24 year olds, which lasts from 6 weeks to often less than 6-months, although in some cases this could be up to 12-months. This is not a job but an opportunity to learn employability and relevant vocational skills and can help prepare an individual for an apprenticeship or a job. There is no mandatory payment (wages) paid to an individual, but an employer is encouraged to pay the travel etc. expenses of an individual.
https://www.gov.uk/government/collections/traineeships