Mr Memory located here:
http://www.mrmemory.co.uk/?gclid=CM7e-NKa-pcCFYwh3godQFFXDQ
States 2 banks, 2GB Max.
I just recently bought an EI Systems Laptop (1303 off the top of my head) for my lad for christmas and Mr Memory stated the same.
After removing the cover underneath the laptop I only found one slot so after extensive net surfing it became apparent that there is a second slot under the keyboard but you have to take the keyboard completely off from the top.
There is a screw underneath the laptop (in the middle of the big cover) that has KB marked next to it. I removed that, then there are 5 or 6 clips around the keyboard that have to be pushed back with a small knife or something to release the keyboard.
So does this mean I could have 2x 2GB = 4GBs of Ram??
EDIT: heres the link I found with a diagram showing where the clips are:
http://img403.imageshack.us/my.php?image=memoryof7.jpg
Have you tried the above ?
In the end I decided that I couldn't be bothered with the keyboard method and only yesterday fitted a 2GB module to the single slot under the laptop.