Thanks for that Cornish.
Sadly all numbers lead back to the same call centre, whose manager is being totally intransigent.
It is my fault apparently that I could not reach the number issued on the answer machine yesterday, despite the fact that is a number unavailabe outside of the UK.
Now that they are open for business again and available, I am too late to make any changes, hence the old dear looses her Christmas trip.
Not really what expected in the circumstances.