Off topic somewhat, I just read this:
In May 1955 a further 33 Victors were ordered. Handley Page's test pilots had fun with their new aircraft - after test flights over the North Sea they would often 'forget' to tell Air Traffic they were coming back, which they did at maximum speed and altitude in a dead straight line for the UK. The only fighters in the country that could intercept them (and regularly did) were the American F-101 Voodoos of the 81st TFW. A shameful tale in terms of RAF defence capability of the time - but it showed how impressive the Victor was.