Detective Chief Inspector Dave Whellams said it had been a "serious, horrible offence which required a degree of planning and calculation":
Mary Konye has had to purchase, at some point, some sulphuric acid. She has prepared for this over a number of months, even years, all resulting from a trivial, insignificant argument that everybody has in their everyday lives.
But Mary Konye has taken this so far that she has planned this, disguised herself and followed Naomi on that night of December 29 2012.
The result today will give Naomi only some comfort but she is never going to be away from the fact that she is scarred, every time she looks in the mirror she is going to be reminded of the fact but it will enable her to start to get some closure.
She is a very brave woman and one I have great sympathy for.
More top news
Kurt Cochran and his wife Melissa had been visiting London from the US to celebrate their 25th wedding anniversary and were due to fly home.
Rail union RMT have slammed the move saying the company MTR is set to make "a killing at the British taxpayers' expense".
The meeting was arranged in the wake of Wednesday's terrorist murder of four people in Westminster.