I finally stopped delaying and made my first "investment", such that it was.
I bought into a FTSE 100 tracker while I continue my research into where my money should really go. This should probably be the cue that professional investors have been waiting for.... when naifs such as me buy into something that has risen so much over the last two years, it surely must mark the peak.
Nevertheless, a paper profit of 35 (pence that is) just before market close is now a paper loss of 42p. I think I'll just leave it alone for a while.