[Nimbus]

Disney prices do fluctuate slightly - for example, the 2019 14-day tickets recently went up in price by £10 because the "14-days for the price of 7" ended. In previous years, the price of the next year's tickets reduced by around £40 or £50 in mid-December. So, if you don't mind waiting, you could see if the same happens again this December. But that might be a little late if you're going in January and wanting to book fastpasses.

I'm not sure where you saw the 2020 14-day tickets for £385 each. That sounds more like the price for 2019 tickets not 2020 tickets. At the moment OrlandoAttractionTickets.co.uk are selling the 2020 14-day tickets for £435 each. I'm sure lyn1 will be along soon to suggest a cheaper seller.