OK, worked out how to turn on IT0105 STy0001
Pretty simple really. Just go into PA30 and create the infotype then put the username in the Id/Number field and click save.
I've recently started working on SAP HR (ECC 6). This blog is just somewhere for me to keep notes of things I've found like lists of transaction codes, infotypes &c. If it's useful to anyone else then great, if not then no worries.