I check the price of my RR sport with WBAC on a regular basis.

The latest price was a bit alarming. It’s dropped £4600 in 6 weeks.
Should have cashed in 6 weeks ago

Mine has gone down £8k in a similar period, but I didn't want to sell then (or now) and even with the current estimate, it's worth £18k more than I thought it would be at this point.

So I'm still winning and anything I'd want to replace it with is more expensive, so the market dropping 10%-20% is a good thing as the cost to change gets smaller. MY23 Panamera E-Hybrid
MY19 SDV8 Autobiography - Sold

As mines a 2006 TD6 this does not really bother me much, another 800 ish miles and it will reach the 100.000 mile mark

WBAC quote you a price and when you turn up go over it and offer you a a lot less, criminal in some cases.