Yes, definitely Yes is the answer. Various other answerers have supplied reasons but as often as not, the newscasters decide upon showing items which are of interest to the maximum number of viewers within a very short time period. So, Luton wouldn't be interesting to many viewers outside Luton.
It used to be the case that a "Not North of Watford" kind of censorship was applied by London-centric journos. Lately, newscasting is much more widespread.