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Originally Posted by kiwi_bloke
At first I thought it could be injectors - but however if theyre all original then they should all have the same wear ...should they not? So, from this I thought possibly the fuel distributor and more likely than injectors 
That doesnt make sense does it?
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No, injectors don't necessarily "wear" at the same rate, not do valve guides, cylinder walls, or piston rings. If you tear down an old engine you will normally find one or two cylinder walls worn noticeably more than the others. Same applies to valve guides. For various reasons identical components inside and engine don't wear at the same rate. One or two will wear a little faster and at some point the greater wear accelerates the wear rate until one or two identical components are significantly worn more than the others.
Rate of oil consumption is a good indicator of valve guide seal condition assuming the valve guides and rings/walls are not severely deteriorated.