Fuel tank breather - Fuel tank breather

The fuel tank in my UK specification 1974 P6B has two breather pipe connections close together near the fuel filler pipe. The tank was recently removed and re-installed by others who left the plastic breather pipe loop in the rear left roof pillar disconnected. Both of the breather connections on the tank have plastic pipes attached which run to the right side of the car. One disappears downwards forward of the tank and the other loops up into the right roof pillar before dropping down again forward of the fuel tank. None of the breather pipe arrangements in the manuals that I have resemble my installation. Can anyone tell me the correct breather pipe arrangement?
 
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