Just wondering if they're is any update here.
Fwiw I don't drive, have never had lessons, and am driven to work by a colleague!
BUT
I found the colleague on www.liftshare.co.uk so I know she wants to give lifts, and the website gives you an indicative petrol contribution, which I exceed.
Also I've suggested pick up and drop off places which suit the driver - I know the area much better than she does so this was needed.
The car share now has 4 people in it, so the driver is raking it in, and three other people have a much easier and cheaper journey to work, so win all round.
I do think it's very sad, especially from an environmental viewpoint, that so many pp think it's better for the colleague's husband to drive her to and from work, an extra four hours of car on the road completely unnecessarily.
If OP needs headspace then fair enough, but if OP can cope with the thought of taking a passenger, maybe 3 days a week, then I think that could work really well for everyone.
I'd approach it in the way pp have suggested, but say you've been checking on liftshare websites and the suggested contribution is x, so if colleague wants to continue long term then let's set something up along these lines to make it fair going forward.
The petrol cost will be so minimal compared to bus fares.
However I do also agree it is weird that the colleague hasn't offered any money. Before my formal liftshare arrangement I got the odd lift from teammates, and is happily accept one or two but after that is insist on buying them breakfast when we went for a team fry up (£2.50 in work canteen). The gesture is very important IMO