The original set-up out of book called for 29UKE, and 16 UKP. You are probably not counting British Columbia (Canada) w/Pac. The line was drawn where the 2 maps meet.
The Alpha.2 set-up changed things. It awards West India (2 ipc) to UKP, and Brit Columbia (1 ipc) to UKE. This makes it 29 ipc’s for UKE, and 17 ipc’s for UKP.
I think it was done so UK Europe could not build a minor IC in W India and produce units there. Plus it just makes more sense to give all of Canada to Europe, and all of India to the Indian econ. This also gives the Pac side 1 extra ipc when its all said and done, helping out a relatively poor economy.