I have to agree with Arrestahook. The fact that Sywell's surface is grass is what makes me want to use it; it is an historic airfield, and it has atmosphere. I flew in to meet a friend there for lunch recently, and we sat on the balcony of the restaurant watching the Harvard come and go in the sunshine - lovely. That ambience will be lost with a hard runway, and I can't see that installing one will bring in enough to pay for it, even allowing for the non-waterlogged days it will be open. Besides which - what disruption will there be while they are building it?