After reading a wealth of information on flashcarts, I decided to buy an m3 from a website called model-gadget.com
If I recall correctly, m3 lites only work with ds lites and I am currently looking at two differently m3's.
M3 Lite Pro & Passcard 3 - £29.50
M3 Lite & PassCard 3 -£49.99
I did remember seeing something about the pro versions couldn't play gba roms. Although it seems from the site description it does has some limited capability of playing gba roms...
Any advice on which to get? Both do not come with microSD cards though, any help would be appreciated.