An update, car is sat outside & i'm not at work today so had a proper look, looks like all four tyres are past it in my opinion & I have found the manufacture date markings.
Their manufacture dates are -
- Week 49 2014
- Week 37 2013
- Week 02 2008
- Week 48 2007
So at least 2 of the tyres are 12 - 13 years old, i'm a bit baffled how one predates the registration of the car & is a random Chinese brand so wouldn't have left the factory with it, it is of course also cracked to hell but it was wet yesterday so wasn't as visible, the 2008 tyre is a continental of some description so I presume this one is actually factory fitted as it matches the cars reg year.
Front passenger side tyre also has a gash which i'm pretty sure is down to the cords.