Sweden had LHT until 1967 but the cars were all LHD. It's a bit odd considering that SAAB and Volvo probably had exports to the UK.

In the 1970s you would on country roads that drivers drifted to the center due to old habits.

Once you are used to LHT then driving LHD is not a big deal. I just did not want to go through the learning curve. It took 1-2 months to be completely comfortable with LHT (with a RHD car) and then it became second nature.