It's the day and age folks. For over 30 years the UK has been someone or other's terrorist target. I see an idle query about what goes on in '......' as suspicious, a query of 'is the ID unit in '....house' as innocent. These people are looking for targets and they appear to have reasonable intelligence as well. It does help when people advise the basis of their experience or query in a question instead of leaving it to you to answer or not, and how deeply the answer is to be given.