A decade ago the very thought of such an incident on a British street would have been unthinkable. Sadly I do not think it will be the last.
British Muslim terrorists have moved their game up a notch,they seem to be working under the single cell system, clean skins without record, minimum use of computer/cell phone devices, difficult to gather intelligence on such people, no sophistication or time span in any degree goes into planning, no quartermaster required, no camp attendance or association with T.O's (training officers).
I don't want to be alarmist, but if such attack operations were to occur again in the UK we could see some group or collective individuals deliver a measured response.
The government are playing the seriousness of this incident down this morning, much as they did after recent council elections.