English classes wanted

We require a English teacher to help our 34 employees to learn / improve their English.  We will split the employees into 5 classes based on ability.  We require one 1 hour lesson a week for each class.  The classes could all be on the same day or arranged to suit the teacher but must be during working hours.  In total this is five hours of teaching a week.  We expect the lessons to continue for many years.  We are based in L'Hosptalet de Llobregat.