Just got a dispatched notification..
https://primenow.amazon.co.uk/dp/B06ZY7K5N4?qid=1545174309&m=A1GYXWXQK6SBX6&sr=1-2&ref_=pn_sr_sg_2_img_A1GYXWXQK6SBX6 Extra £2+ but if you need it before Christmas this is a good option. Plus I used the code HIGH5 and got £5 knocked off.
Next day prime delivery does usually work for us in Newquay, sadly not the case for this item tho I would sooner the mario party bundle came in to stock!
Yes, delivery in Cornwall generally adds a day onto prime time. I only know this as I live in Coventry, but my parents live near lands end, and this is always the case when I'm doing deliveries between them and myself!