I know it goes against the grain a bit, but I often find that, with stuff like this, it really can be better to speak with the local authority before acting and get the officer on your side from the outset.

Like a lot of things, its a lot easier to work with someone than against them

It won't apply to a session which is already in operation, but if you are looking to set something up, you might well find that the officer will be as helpful as he can be to facilitate what you want to do. Let's face it - the option is to have them 'find out' about it at a later date, when they feel obliged to 'do something'. If you 'engage' them from the beginning and 'seek their advice and assistance' from the outset, you might be surprised.