Hi Ingrid,

I presume, just like Koi-Lo, you have missed the fact that this will
involve a sea crossing....at a time of year when you can describe the
sea as "choppy" at best.....Yesterday, wind speeds in this area were 80+
MPH....I wouldn't have wanted to be on the sea let alone transporting
fish across.....

My advice to the OP would be to find a new home for the fish or to get a
professional shipper if they are willing to pay....no way would I take a
fish across the Irish Sea at this time of year.....and I would be
reticent about doing it any other time of year as conditions are
unpredictable....

I have moved fish from house to house in the past....and did use much
the method that you advocate.....on a local move it isn't a problem and
in truth is the only way to do it.....but a journey of this type it is
not feasible to use the methods that we would advocate for a shorter
trip - even if we count 500 miles as a short trip....it is that many
miles, across sea, with the tank and fish sitting in the hold with no
control over what happens to it, a long, long wait to get on and off the
ferry.....you can add at least 3 hours onto the journey (believe me I've
just done it)......

The OP either needs to rehome the fish or pay big money to get it
shipped by air.....sorry, no other option

Gill