Pielander,
You should have no problem at all with Pool Aviation. I flew from Welshpool until I discovered helicopters, and often took a Tomahawk away for a whole day at the weekend. They like you to fly around three hours, but there and back from Welshpool will be about that anyway. And they have no problem with grass; I've taken their aircraft to Derby and Barton.
Sywells's nice, and fairly central - not all of us live in the south-east.
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Whirly
To fly is human, to hover, divine.