It used to float around a £5k per series gap & condition.
£36k S1
£42k S2
£48k S3
£55k S4
£90k+ for a Max
This climbed gradually over time.
All depending on seasonal changes and buyer interest vs stock.
Given WFH and other elements like the entire S/H car market going up I figure this should have gone up further as more people are looking for that fun moment.
The recent listing of SS and GT series at £150k+ makes for a different picture if it should stick?
The key is buyers with appetite and a chance to drive one, which changes it to a likely. I still remember my first drive in the S1, it made it happen, not then but it was going to happen after that.