Leggendo il prospetto gentilmente postato ho capito che fino al 2020 pagano il 6,625% ma per il dopo, se non viene callata, l'emittente calcola la rata un pò come gli pare
(d) Reset Rate of Interest
From (and including) the Reset Date to but excluding the Maturity Date, the Notes will bear interest at the Reset Rate of Interest. The Issuer will appoint a Calculation Agent for the purposes of determining the Reset Rate of interest.
(e) Publication of Reset Rate of Interest
The Issuer shall cause notice of the Reset Rate of Interest to be given to the Trustee, the Paying Agents, any stock exchange or other relevant authority on which the Notes are for the time being listed or admitted to trading and, in accordance with Condition 15, the Holders, in each case as soon as practicable after its determination but in any event not later than the fourth Business Day thereafter.
(f) Determination or Calculation by Trustee
The Trustee (or an agent appointed by it) shall, if the Calculation Agent does not for any reason determine the Reset Rate of Interest on the Notes in accordance with this Condition 6, determine the Reset Rate of Interest at such rate as, in its absolute discretion (having such regard as it shall think fit to the procedures described in this Condition 6), it shall deem fair and reasonable in all the circumstances and such determination shall be deemed to be a determination thereof by the Calculation Agent.
che voi sappiate o intuiate, ci sono dei meccanismi di salvaguardia dell'investitore per non vedersi riconoscere una cedola troppo bassa in caso di mancata call ?