Latest official (via Shippax) figures show that Stena have had a strong double digit growth in passengers, cars, and buses on Dublin - Holyhead during April, whilst everyone else is down with the exception of marginal growth in car numbers for Irish Ferries.
A "Double digit" increase could be as low as 10%, whereas a "Strong Double digit increase" could be interpreted as meaning 15%+.
On this basis, I would describe the 8% increase in IF car numbers as better than "marginal".
If I was to hazard a guess as to where the Dun Laoghaire traffic will go, I would say:
- 50% will be retained and transferred to Stena's Dublin sailings (as long as DL does not re-open to alternative provider)
- 25% will go to Irish Ferries (mainly Swift)
- 25% will use Fly / Drive
I also assume it will lose as many customers as it generates new customers.