The camber pulls you to the left, so you have to put a little 'right-hand-down-a-bit'. This wears the LH front tyre more on the outside edge, giving it a truncated cone shape. This shape results in even more pull to the left. It can be compensated for by swapping the front wheels (if the tyres aren't rotational). If the tyres are rotational, the best you can do is swap the wheels front to rear.

I have to do this in the VW Caddy I use for work. We also have a Suzuki Ignis, but I can't say I've noticed, so if it does drift to the left, it is much less noticeable than the Caddy. Also, just to point out, I am very rarely on anything other than single carriageway A and B roads.

Yeah, I assume it is car dependent so interesting to hear the experience of others. It does seem camber-dependent - driving in the centre of the road, the wheel seems more central and on the other side or on an adverse camber, the wheel tends to need to be held a degree or two to the left instead.

A good portion of this though is road-dependent - I've driven on dual carriageways that tend to slope in one direction (and that can both to the outside or division between each carriageway) so that water collects only on one side, where the drains are, whereas other ones are more like single one-up-one-down roads with a crown in the middle between the carriageways.

I think they are more pronounced in the countryisde where adequate drainage via road drains isn't so common, just ditches. Perhaps some older dual carraigeways don't have that good built drainage and have to rely on similar methods, and thus may need more pronounced slopes / crowns.

Saving on built drainage and utilising ditches is also likely to be a 'cost-saving' measure, though I would guess it wouldn't be over the long term, given problems (and thus costs) caused by flooding and knock-on effects of undrained pools of water (ice damage to roads, skidding/aquaplaining causing accidents, etc).