YOu said you were looking for a picture of the inside of a DuoTec.
This is the Potty Gold........same boiler
http://www.potterton.co.uk/docs/Potterton_Gold_Combi_HE_Brochure.pdf
This is the Potty Gold........same boiler
http://www.potterton.co.uk/docs/Potterton_Gold_Combi_HE_Brochure.pdf