Not critical at all tbh. The engines are designed to work with certain tolerances and it's the reason they have a rev limiter. They will also have been tested in the factory, most likely to the red line. It still would be worth taking it easy whilst you adapt the the new car though.
Thanks for that, i do a lot of mway driving, but I try to stick to the speed limits so hopefully my engine shouldnt be killed off in the first few weeks.