I bought one of these 4 portion models from argos, i ended up shouting at my daughter thinking she wasnt putting the tray under properly. 8 months later i discovered i wasnt her fault, it was actually a design fault with this model. The grease was going everywhere... eeeugghh. I phoned up argos who told me i could exchange it if i could find the receipt... didnt have a clue where it was, so they told me i could send it back via post at my expense.
Well i wasnt having that, so i went into store showed them a statement of when it was purchased on my laptop screen and they exchanged it for me.
So just some advice if you have this model, it is an actual fault, so go and exchange it!!