My Octavia 2.0tdi is on fixed servicing, are there a full service and interim service on this system, i.e. is one years a full service and the next an interim service like my wife's T*yota ? Thanks.

Yes, this is all detailed in the service booklet including what is changed / checked.

It varies from model to model and engine to engine but there isn't much difference between the interim and full service, just a few more visual checks.

Brake fluid needs changing every two years and the cambelt around four years. These periods are disputed on several threads on this forum so best to refer to your service book or ring your local dealer / Skoda UK.