It will become very noisy, then sooner or later it will self-destruct leaving you stranded and maybe even standing in a pool of oil. That is, assuming that you ever put oil in it.
A failed MoT test inspection, followed by the inability to tax it for road use, and the possibility of licence endorsement points, a penalty fine and the vehicle being recovered and crushed if stopped while in use in that condition on a public road. The knock-on consequences of that event would be increasing insurance premiums and an inability to hire vehicles while the licence endorsement points exist, up to and including the removal of the driving licence privilege depending on the number of endorsement points on the licence already.
It would be cheaper to either fix it or scrap it.
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Kolo, Is it the vehicle's engine big end bearings,Main bearings, wheel- or alternator- bearings? Has any tests been done, measurements, oil pressure etc?