I went to Warrington this week to do 3 training courses at Baxi's training centre. The coureses were; basic electrical (using a multimeter, testing components) combi appreciation (inside a combi, all parts and how they work and faults) boiler diagnostic ( classroom in the morning and workshop after lunch). I would defo recommend these courses, im trying to get into service/repairs and found these courses full of usefull info. You can read as much as you like but you always learn more if you're being shown by someone. The tutor (big Roy) knew his job very well and had many years of experience to share with us all. Anyone looking for breakdown/diagnostic courses wont be disapointed