on the L's the left boost pump is connected direct to the battery. That way, if one has complete electrical failure, you will still have the left boost pump operating.
Close, but not quite correct - depends on what you mean by complete electrical failure I guess - but more specifically a failure of the battery relay will be the ultimate reason for the left hand pump being directly wired to the battery. Not sure it has been mentioned but the reason for this is so that without any boost pumps, fuel from the forward tanks will not be transferred to the main tank and hence becomes an unusable quantity.
Something not often realised is that the fuel pump warning lights in the 206L series actually sense flow and not pressure. Only by cross referencing the fuel pressure gauge will you be able to determine if you have had a pump failure or just a venturi blockage within the poorly named 'transfer
pump system'