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Joz, I originally responded to your other thread, so repeating what I wrote here:

Your experiment was great - it did definitely point to a problem pumping fuel. But before you replace the fuel pump, check the vacuum line running from the pump to the crankcase - if this is soft, or leaking even slightly, it will rob the pump of power. It's just a piece of 1/4" fuel line, so you might even want to replace it and repeat your experiment.

That said, your problem is most likely the pump itself - I don't know if they still sell rebuild kits for the VRO pump, but that would be the way to go if they do, and if you want to go back to a separate oil tank. You could of course also replace the pump - the VRO pump is big bucks, but if you're OK with pre-mixing, you can get a non-VRO pump, as mentioned above, for a lot less.

Tim