Get to argos now and buy the keyword smoothie2go maker! It's £24,99!
read the reviews, that will tell you enough!
i bought one yesterday and it makes my LT shakes the same consistency as McDonald's (adding ice blocks too!)
really is worth it i promise you will not regret it!
or here a bit cheaper:
Kenwood SB055 Smoothie 2GO Silver 1 on eBay!