@RiskIt4Biscuit, the Byrdie 2018 advent calendar article has a release date of 30 October and the Vogue 2018 advent calendar says it will be sold via Feel Unique but I'm sure I read somewhere else that it will also be available from Look Fantastic.
I have little self control, so I tried to find a youtube unboxing of the 2017 lumene calendar (doesn't look like it was sold in the UK back then) to see what sort of things were included but none of them had subtitles but there is a blog I found called Life of Menta and she shows the contents of the 2017 calendar day by day. The 2018 one looks more interesting than the 2017 one, there were a lot of similar items in the 2017 one.
I'm very tempted by the Lumene one and the Espa calendars
Only one empty from my September list - which is nowhere close to being finished - Korres Vine body milk, smells lovely, will buy again once I've used up my body lotions.
Also used up
DHC silky cotton pads, these claimed not to leave fluff on your face, they were less fluffy than normal cotton wool but still some little balls of the fabric on my face when I put on my moisturiser.