We will be returning a rental car to London on a Monday afternoon in September. Is it best to return it at LHR, or drive into the city somewhere? we will be checking into a hotel in Bloomsbury.
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It depends on where you're travelling back from and where you picked up the car.
If you've been located in London with the rental car, I would just return it in London.
If you've been travelling outside of London, I'd investigate dropping off somewhere on your way back to London that has a direct train service to London, either Heathrow or other locations along the way. Other locations will probably be even less busy than Heathrow, so may be preferable.
It's worth noting that dropping off or picking up at airports often have surcharges attached, so I would check that as well before settling on Heathrow. In addition, picking up and dropping off at separate locations can attract a surcharge so that would also be worth checking.