Wipe the codes off (This is the first thing the dealer will do)
Take it out for a jaunt and see if it occurs again. If it does, Print off the VAGCOM report (What you've shown us) and take it to Thompson and Thompson if under warranty they'll do it free of charge.

Tell them Ramsey with the Silver Cupra recommended them ;)
I visit them weekly with bits and bobs!
 
There is, what looks like a full VAG engine fault codes on Briskoda - in the VAG COM and Diagnostics section of the forum - you can view this without joining (I think). I'd think that its normally the heater circuit on sensor 1 (sensor nearest the manifold) that seems to fail on these cars, so I'd expect them to tell you that they need to replace that sensor. As time goes on, if this is the current fault, then it will appear more often and finally stay on all the time when the sensor has become completely u/s.