The last date that you can order from embersandink.co.uk for expected Christmas delivery is the 16th December 2021. I will then post on the 17th December 2021. Even though embersandink.co.uk will stay open past this date, anything ordered after this date will not be posted for Christmas delivery.
Please note: I say order for expected Christmas delivery - not guaranteed Christmas delivery. As I also rely on the Royal Mail if they have staff shortages or unexpected service disruptions this may delay your parcel.
So my advice would be to order before the 16th December to give you more peace of mind.