Where in The Netherlands are passengers going to come from to save this €20?
With the price of fuel that it now is, it pretty much only represents a saving from south of Rotterdam or west of Tilburg. We can probably work out the number of people by adding the population of the province of Zeeland (400K) and the city of Breda (200K). That's not that many people.
Add to that, with Ryanair flying Eindhoven-Stansted, it seems unlikely that any higher cost airline will be cheaper than Ryanair plus €20.
Also factor in that the Eurostar now operates to Rotterdam, and the market for flights from the South-Western Netherlands to London is pretty limited.