FlySwift,
Yes, the 4-seater Piper was a little more expensive, but it would have allowed me to take a pax as well. I did ask my Mum if she'd like to come as well, and if so I'd have gone for the bigger one, but she "chickened" but said afterwards that, now she's seen me actually get it back down safely she says she might come next time!
(Gotta suffer another 4-6 months in Knoteetingham before "next time"!)