Sorry for the missed details - I'm somewhat new to this!

I have a record locator for VA (LHR-LAX-LHR) and a separate one for EI (DUB-LHR-DUB). Do you therefore think it will be OK to drop the last flight? I'm not too worried about the journey on the way out as I have over 4 hours in between flights and it is only the last one on the return journey I want/need to drop.

Also, based on their being two record locators are you confident that dropping the last flight from LHR-DUB will NOT have any affect on the tier and miles I'll earn on the VA sector?

Thanks