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Assume your on the morning flight to connect with the lunchtime UL flight to LHR.
If so CX would be the choice lounge, near new and very nice.
Your only other choice (and the only choice for the evening flights on some days) would be the third party Louis Tavern lounge that UL should give you access to via your QF Gold (or COS - you didn't mention cabin or time) or depending on the time you could go to the JL lounge but its not much
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