Assuming youve printed off some helping notes from uktsupport.co.uk, there are important details they overlooked, or do not mention:
there are no clips to remove, but 3 tiny latches to depress away, before the keyboard can be lifted out.
They are located in the space between the following keys and the main body of the machine: ctrl, alt gr, down.
Explore their location first (with torch), then depress each latch in turn with a small (watchmaker) screwdriver, away from the keys, allowing the metal keyboard base spring above the latches.
The memory slots - one will be free, the other occupied, are located under a square silver metal cover, which is secured by one screw.
Good luck,
Rudolph Repka
April 2005