Hi basil123,
It sounds like the remote paired to the upstairs box in error.
Try turning that box off, and then unpair the remote you want to work with the original downstairs box, and then pair it again.
With only the downstairs box switched on
Press TV and Clear at the same time until the light on the remote flashes green.
Then press thumbs down 3 times followed by OK twice.
This should reset the remote and force a re-pair following https://www.virginmedia.com/help/virgin-tv-pairing-tv-remote
Dave
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