I am NEEEDING new tyres, but I am struggling to find decent tyres in the size I want. There are a few there, but what I want to know is how worried I should be about getting above 'V' rating. Or will 'V' rating be adequate.

We all know that my car can just exceed 149mph. If I were to put 'V' rated tyres on, will I be worried whenever (on the private test track) that I exceed that speed?