For an upcoming flight, it's looking quite a bit cheaper to take the Eurostar to Brussels, and fly from there, rather than fly direct from the UK as I would normally do. The Eurostar bit I know well, it's the Brussels Midi <-> Brussels airport step that I'm new to.
Does anyone know what the best way is to make this transfer? Ideally something that's fairly quick, and not too expensive. For the recommended option, information on average journey time and service interval would be helpful too, so I can work out which Eurostar to aim for based on the flight.