Ishihara
Hey Neoro,
Bit late - but the Ishihara does have small numbers on it.
I have the 24 plate version, and the 38 plate version. You can buy them on Ebay.
The numbers are too small to read, especially as the doctor makes your read them at arms length.
The individual plates are the same in all tests, whichever doctor you go to. The 38 plate test consists of the 24 plate test plus a few more.
At Gatwick you only have to name the 1st 15 plates - but no mistakes are allowed.
If you only got 1-2 wrong, it may be worth buying the book and 'getting used' to them.