I tried it...
... and it was very bodgy, there was some kind of PDF template I had to download and fill in. Whenever I got it the end, it would not let me submit it due to "missing fields". After lengthy dialog with their "support" (a bored, non-technically literate lady, who didn't know what a PDF was)... we concluded it was best if I submitted it via the post as normal.
Hmmm....