all the bits from the stealer are Knecht/Mahle in the box.. they are the OE supplier.. 
just done mine and non of them were branded by these makes, unless obviously they mark them up with the car makers branding
got my oil which was the quantum brand for free and all my bits for almost cost so in total it came to around 22 quid..
i would only use the dealer for bits like this
i needed a new expansion tank as i couldnt see the levels in mine, my make at the dealer got me one for 21 quid and gave me 2 bottles of the purple G12 coolant too, iv heard non original expansion tanks can be hit and miss