Update `id` with thousands seperator

Apologies, I now realise it was the id, not (just) the connections I was looking to add the thousands separator to, as this is the number that most commonly exceeds 1,000

On a side note, the self.getMessage function (and the `self._messages` & `self._default_messages` properties) are pretty useful but I wasn't aware it existed until trying to debug my changes.

Some more/better developer documentation would certainly be helpful for other 'novices' like myself.