Honestly not being rude or dismissive, but wouldn't it be quicker to enter it into a couple of online checkers rather than wait here for a (possibly incorrect) reply? Try ParcelForce, RM, CityLink, DHL and you'll probably get a result.
Hmmm tried tried RM again, and it didn't say unrecognised Number but rather no tracking info, possible their site is just broken rather than it not being their code?
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