Looks like a European regional release modified for sale in the UK. Doesn't look like anything special here. Might be a first pressing that they forgot the ratings logo on. Remember DMA hired a lawyer to kick up a stink about the game's content, so the red 18 is part of the marketing here too.
That's quite sure it's a UK release. Maybe you're right, but who modified and why? Neither do I think it is special. The logo lack is okay, perhaps they forgotten, but the yellow disc is very interesting. I think this is a wrong pressure or something fake edition. I knew just three big box release so far.
1. DMA & BMG logo, red disc, age limit everywhere
2. DMA & Take2 logo, red disc, age limit everywhere (Take2 acquires BMG and they relabelled first the BMG logo onto Take2 logo later print already with Take2 logo)
3. Limited Edition release: DMA & BMG logo in the front but back relabelled onto the Take2 logo, purple disc, purple soundtrack, age limit everywhere
I hope someone will be able to say something real information.