If I am not mistaken, the chunnel is also used for freight trains / hauling trucks on trains...
Just like at an airport, not everything is passenger operations.
The car/freight shuttles, which are running normally, are operated by Eurotunnel. As mentioned by SWBKCB Eurostar is a passenger only operation. Hence the questions about the relevance of cargo aircraft.
Nice one, fuddle! Just hope MOL hasn't read you post or he could come up with new cost savings at RYR.