We are impacted by this one, and having been through this twice in about six months you can't help but reflect that P&O could deal with it better. That includes long waits for deposit refunds, poor/no communication with travel agents and seemingly ignoring booking condition 40.
In terms of the alternative cruises rising in price, easy tip first, we rebooked the previous sailing for about £100 less than we paid, appreciate a lot of factors will dictate individual costs, but worth a check if you have date flexibility.
I can't say too much on our first case, ABTA have a gagging clause as part of their arbitration process, but would urge anyone impacted now to read booking condition 40 and detertermine if they feel they have been offered each of the options afforded to guests in this situation. If faced with an increased cost to re-book another cruise, is there an alternative package of comparable standard available that meets your needs you should have been offered, as according to booking condition 40 “the guest will have the choice of… accepting an offer of an alternative Package of comparable standard if available…” You only have 14 days to confirm, so act quickly if you plan to try and rely on this clause, and don't expect an easy resolution!