All plate searches for this return a Fiat "Burstner Lyseo" campervan, which now has the plate AM57TAG. The plate frame as far as I can tell from this distance looks to be in cyrillic? The number is brackets doesn't look like +44 which would befit a UK dealer. Perhaps best to put this as a plate without vehicle until confirmation can be found?
"Avtocentr Kyiv" really! I didn't notice it earlier. Unfortunately I didn't notice if this car was RHD too.. Lubaczów is placed near ukrainian border but border guards for sure won't allow to enter Poland any car with fake plates.