Yes, I was part of the LBE team who tested the park ride before it was installed at Windsor (not too far from the LEGO offices in Slough)
From what I can remember the touchscreen panels were a bit of a nightmare to start with as they had to be designed so that small children could use them easily. The only other issues we had were getting the game play balanced enough so that anyone could win no matter what design their car was.
Some of the track shortcuts caused a lot of arguments between testers when they forgot to use one.
I think the overall test cycle for the ride in-house was 3 months and the test department was a bit of a mess with PC's and network cables running all over the floor. I seem to remember some of the team going to LEGOland Windsor to help out with the installation of the ride, I was busy on another project by then.