Ah! Its in a guide somewhere, the spark plug guide I think. TO maybe help (hopefully not confuse):
If you look by the spark holes, the numbers are cast on the head. Then if you look at the coil pack holder under the coils (the metal part) they are cast on there as well. Just match them up
The order of plugs goes from the belt end to gearbox end 1,2,3,4
As long as 1+4 spark plugs go to one coil pack, then 2+3 go to the other coil pack, you'll be ok with regards to HT leads. (as long as you took the pairs to the correct coils)