Ryanair flight time change - pros and cons of clicking "Accept"?

[therebemaggots]

Ryanair have moved my flight back by 4.5 hours. It is marginally less than their threshold for a refund, which is 5 hours, so I can't cancel and book with another airline. Their email says "you can choose between accepting the new departure time or changing your flight for free".

There are no other flights that day, and its not practical to change it to a day earlier/later, so I effectively have no choice but to accept the change. There is an "accept" button, but I have seen a snippet of a Telegraph article that says if you formally accept the change they can move the flight again, beyond the original 5h limit. So I'm doing nothing for now. Is there any disadvantage in doing nothing, and just turning up for the (later) flight?

As l understand it, the flight will still be available to you if you don’t click on accept. Unfortunately, airline passenger rights have been significantly reduced by Brexit.

You can try asking for a refund, but to be honest l can’t see that happening.