I think keeping Tarka plus a 3 Wheeler sounds like a much better choice!
I have driven the Creme/Green Manual car as well, and I will be honest I was a bit disappointed.. I expected it to be light years ahead of my S1 (considering its an S5!) but it felt almost exactly the same.. except less 'alive'.
I thought the interior was nice if a bit bland, which for the price isn't great tbh.
My biggest bug bear though was it felt a lot less responsive and slower than my S1, I felt as if my S1 would eat it for breakfast in a drag race - and considering its on paper 50/60bhp down was a big suprise.
The 3 Wheeler I drove however...that quite frankly was epic, and I do hope in the future I have one in the garage sat next to my Aero!