[gdgegeg]

Taking your statement of factualness at face value, this councillor is behaving shamelessly and inappropriately, in a manner that would not be politically advantegous if discovered more broadly.

While it may not solve your immediate problem of wishing to remain anonymous, it may be worthwhile writing of this to Private Eye. (https://www.private-eye.co.uk/). If they shine a light on you, shining it back may be your best bet.

As someone who runs a political blog in the UK, you are almost certainly aware of the magazine's existence. However for others, the magazine features a consistent section of the shameful acts one finds across local councils across the UK. While the readership is niche and the content is almost exclusively in print, not online, it has an outsized impact in media and political circles.