Curtain airbags & ESP fitment

Apologies in advance for yet another question about spec levels, however I have been back through pretty well all the forum and fairly sure haven't seen it asked ( sad but true,I worked my way backwards through all-then- 370 odd pages a couple of months back,well what else to do with all that snow and ice outside...)

In the first instance,what kind of proportion of the various Octavia II trim levels typically have had the curtain airbags specced' from the options list ( I believe I am correct in thinking that the L & K is the only model with them as standard ? )

Similarly,how often is/has ESP been added where it is not standard ( L & K, VRS, Scout and 4x4 have as standard ?-if I have been paying attention ! ) Of course any ESP equipped car would need "due diligence " before purchase given the ABS unit failure issues of late.

Thanks in advance for any guidance you can offer, have to say having kept an eye on postings over the last few months that the forum certainly gives a very useful overview of the Octavia for non-owners.

S_P