European Gardening: Coming to UK/Ireland this Summer, 1 by Evert

Evert wrote:
I just booked the ferry tickets for us and the car, for 3rd June, from Kristiansand (Norway) to Newcastle (England). We will be there on 4th June then. Now I looked at the prices for ferries to Ireland and back, and they are just horrible!! Over 100 €... Our Norway-England ferry cost 343 € (230 £).

Has any of you travelled from the UK to Ireland and vice versa? How much did you pay for the tickets? Know a source for cheaper ones?

This is how our route would be basically - I don't have any idea of the sights there, only know Stonehenge which I want to see for sure ;)