Ryanair actually have a good on time record, there is no profit in delay, and a morning flight is unlikely to see the plane delayed by earlier events. Your problem is that if it is late you lose your connection. I'd check carefully the checkin requirements, the rules of the ticket, and the fine print of your travel insurance. One thought, check if AC still fly via Shannon (the Shannon stopover is being discontinued) and go London- Shannon instead, giving you some more time.