Need to put in & in external text-file

Can someone help me with this? I have made a gallery with externally loaded images and text. The text comes from a .txt file. The textfiled is rendered in html.
The text-file loooks something like this:
textNo1=<html>This is the text where I need to put an &</html>&
Now my lient needs to put an &-sign. I have tried to use the & and also the excape code \u0026 but it doesn’t work, at least not the way I am doing it. Does anyone know how to do this? Is it possible? :frowning: