MrBadger
Badger out
If the "10% more than a Model 3" comes from tesla then it's more logical to believe this and apply it to actual Model 3 sales prices than to look back on why the public underestimated UK Model 3 prices by not understanding the detail of tax, import costs etc.
When Model 3 pricing was announced, I called Tesla re indicative UK equivalent. They said that then current S&X UK OTR pricing was approx iirc 1.15 x the US headline price. A big assumption, but applying that to Model 3 bought base Model 3 (which never saw light of day in launch spec even in US) in iirc somewhere between £31-32k. Add on gov grant (can't remember what it was at that time) and come UK release time partial premium and autopilot were added onto base spec and numerous price adjustments, that 1.15 multiplier probably wasn't too far off.