Please note that it is VERY important to fill in your ESN card! When you buy one, fill in the information and add a photo! Without a photo your ESN card is NOT VALID! Just print out your facebook profile pic, and you’re good to go ;)
Here is an example of a filled in ESN Card:
Higher education institution: The university or hogeschool you study at. Most likely this will be GCU
ESN Section: ESN GCU
Country: country where you’re doing your Erasmus, so UK.
Valid since: the date on which you bought your ESN card