I'm completely baffled by I and B2, and I've got a horrible feeling I've put everything in the wrong place. I have I.P.V.D (presumably imp-something?) and B.G.R.E - bogtree? Bigtree? Nothing seems to make sense!
Thanks, zita-green - that's brilliant. Very relieved I hadn't fitted in the other solutions incorrectly. My first time on here, so I didn't realise that filling in the info didn't translate into a heading. I'll know for next time!