OCUK is worth much more than the NAV.
Or more likely there was a dividend payment.
I still have this from a few years ago when I was very bored and actually paid for this.
https://dl.dropbox.com/u/20407/blREX+0L0025-17500_9-03499846.pdf
Ocuk has I believe grown a lot since then as well.
Someone got a good £3M payout in 2007.