Just had my Cupra in for the same
problem ,very intrusive tappetty noise at idle. My dealer had another cupra in stock (sales managers)so I took that out for a spin and it didn`t make the same noise .
Anyway they seem to have cured it ,saying it was the fuel lines vibrating against the chassis .
Bin out for a spin in it tonight and it appears to have gone.
Sadly the same cannot be said for the rattle from the passenger side .
