Maybe I'm answering too late, but I would really not want to use MDF for a desk, of any size. I tried once and the material started to sag. I suppose you could if you made a very sturdy framework underneath. But if you do intend make a sturdy framework, why not spend the £60 on some thin plywood?
What thickness did you use? 25mm MDF is pretty strong. Having said that 2000mm is a big distance to span and will need supporting midway.
What thickness did you use? 25mm MDF is pretty strong. Having said that 2000mm is a big distance to span and will need supporting midway.