Send the FTP server details in the letter to the PI, suggested text is:
The login details are as follows:
user: USER
password: PASSWORD
address: ftp.rsg.pml.ac.uk
link: ftp://USER:PASSWORD@ftp.rsg.pml.ac.uk/
We have a guide for downloading data via FTP available from https://nerc-arf-dan.pml.ac.uk/trac/wiki/FAQ/downloadftp
If you are having problems downloading data or the download is going to take a long time (more than 3 hours) please let us know and we will dispatch on a USB hard drive instead.