Stock is high yes, but I think a few factors are at play here.

1. It should be noted that most of the lower priced Plus Fours on the lot are early versions and there have been some significant price increases since with some changes to the offering. So it stands to reason that a MY20-21 won't be increasing in value to the level of a MY23. IIRC a MY21 started at £64 whereas a MY23 starts at £70 but with items like a standard full leather interior stripped out. Add in what was taken out and a MY23 spec'd to what was a MY21 actually comes out to circa £73
2. Last years recall/stop sale due to the brakes literally wiped out approximately a years worth of sales. Retailers couldn't offer test drives, cars were not being built or to a lesser volume etc. Any leads or prospects they might have or built up were not there.

I recall looking to trade my 4/4 in a few years after I got it and was a bit shocked at the low offer I was given, what with all I've read about a Morgan keeping it's value. However a few more years passed and it levelled out.

As mentioned above, stocks are high across the board and the demand however isn't there to shore it up. It also doesn't help that so much has changed on the CX in it's short life span and as a prospective customer I personally wouldn't be spending this kind of money on a used one when for a bit more I can get all the updates. Just my view of course!

Lastly, look at Aero prices. Prior to the CX an Aero 5 could be had for as little as £70. Look at what they are now! Who knows what the next few years will bring.