I thought that Challenge was an Argos "Own Brand" but I can't find a steam generator with that name / model number.
If it's a spare part, like a filter, you want then you can either try www.argosspares.co.uk or phone 08445570320
Alternatively you could phone Argos head office on 01908 690333 and ask for customer service. Explain what it is that you want or whether it is a warranty issue. They are usually quite helpful.
If you don't get any joy here, the Morphy Richards site (http://www.morphyrichards.co.uk/instruction-
booklets/IB-ironing)
has a number of instruction manuals which may give you some idea of what you want to know.



