Honestly, the PS2 can't be much higher than that this year. Chart Track confirmed that Nintendo hardware has outsold Sony hardware in the UK for 2006 (
http://www.gamesindustry.biz/content_page.php?aid=21402), and also confirmed that DS sales are about 2 million LTD, which puts them at about 1 million units for 2006. I think it is safe to say that GBA and GC sales have been fairly negligible this year in the UK, so that means that Nintendo hardware for the year is a little above a million units. Therefore, PS2 + PSP can't be any higher than a million units combined for 2006.
When you factor in that the PSP started the year very strong in the UK (and I believe it was even the top-selling hardware for the first month or two), then that doesn't leave much left over for the PS2. It depends on just how bad the PSP numbers are for 2006, but really, the PS2 couldn't be much all that much higher than 500k at this point.