Yes, cold oil will make higher pressure. Much higher... but it simply gets dumped across the relief valve in the pump body. The net result is that the rest of the engine is starving for oil. The pressure sensor being somewhat higher up than the relief valve will see a lower pressure, and it is right, as are the rapping lifters. You did the right thing by dropping the oil. I guess if it's desparate cold then mabey 5W20 is in order, but I probably would have went with 5W30 minus the Lucas. While I suppose it's good as a viscosity improver in an old worn engine, if yours is still in good shape and tight, all it's doing is starving the engine for oil because cold thick oil can't flow.
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