Ok, I think ive got that. Thank you so much for your help Pendean. 

I think theres something wrong with my CAD

I have made 3 different text styles: Headings at 5mm, Text at 3mm and Notes at 2mm. For some reason all the text set to the Text style is still appearing at 5mm. Ive checked the settings, something must be over riding it. 

Any ideas? 

Thank you