The Institute of Education Sciences of the Universitat Politècnica de Catalunya – Barcelona Tech (UPC) started a training programme in 2008 addressed at university lecturers wishing to prepare themselves in order to offer their content subjects in English. This training programme was an assignment from the vice rector for international relations and it was aimed at fulfilling the objectives of the Internationalisation Plan that the university approved for 2008-2015. In this paper, we wish to show the experience from three perspectives: the parameters of the institutional assignment and how the Institute of Education Sciences gave an answer to it, the methodological adaptations carried out all along the programme (this will be done by exemplifying them in one sample training course), and some of the lessons learned from the lecturer training programme that has been implemented for six years now.