Got my 2 games (Uncharted and Wipeout) and starter kit from Tesco Entertainment. The starter kit includes 2 decent cases, the cleaning cloth, wrist strap, game case, and cover (with a little alignment helping analogue stick and 4 buttons cutout/guide). All in all, for £20 I would definitely say its worth it.
For those that wanted to know, this isn't a guarantee but the PSVITA slip case is only slightly larger than the PSP one, so you might be able to squeeze it into the PSP case if you so wish.
Pics: Whoops, way too big theyre over here though:
http://imageshack.us/g/843/img20120220114514.jpg/