There's a thread on this (unsurprisingly) on another forum. The guy visited the factory and was in an area where GTIs were rolling off the production line and put onto a rolling road as part of the final testing faze. Basically he said they were redlined quite a few times as part of the initial engine tests (around 8-10 miles).
So I think any on here taking the gentle approach have missed the boat, as it's already sailed