I was there with the Mog Mag entourage as well and for a first effort it was ok, the Prosecco was very nice. Major issue I had was that our cars were parked outside the fence with access through a gate in the fencing. No problem except that during the torrential rain in the morning I went back to the car to collect the umbrella to try and pacify my wife but found the gate locked, which remained the case throughout the day, and the only way back to the car was through the main entrance which took an extra 30 minutes by which time my other half was soaked and not happy.
Being Morgan owners we improvised later on and I climbed the fence several times to collect our picnic and chairs etc.
Agree with Gambalunga but don't think it would take much to make a big difference.