"have you even compared the two they are as good as identical, you'd be making a choice on tyres, colour and supplier."
Nope, the Carrera gets better wheels, the 120mm version of the XCR and more trailworthy handling, with better mud clearance, better brakes (IMO, do not liuke Juicy 3s) and comes out lighter. OTOH the Commencal doesn't have the Carrera's ****ing horrible isoflow chainset though, and it has a nicer logo.
Rufus, you've got to be daft to rule out Halfords at this price, as long as you know how to check it's been assembled right- the bikes are very good. That Cindercone you're looking at is s**t by comparison to the Kraken frinstance. The Kula's nice assuming it's in good nick though.