skeezWhat would be the best/most cost efficient way to get from London to Birmingham?
People generally consider coach to be the cheapest, but at the downside of taking twice as long as a train, however having had a quick look at the National Express (a coach company) and trainline (a train comparison site that some people don't like lmao) and they both seem to be around £7 to £30 depending on what time and day you wanna be travelling, so you might have to shop around, Megabus is another coach company you can try too.
There's a bus and train station near the NEC but Birmingham New Street is a pretty popular train station too so you might find cheaper going there rather than straight to the NEC.