According to this guy, it was on the left. The reason they know seems logical...
See related link..
They drive on the left
Yes, they drive on the left.
no we drive on the left
the left
Drive right - pass left.
you can drive on left or right provided a uniform system is followed throughout the nation.
right hand drive
left
Left hand drive.
right hand drive
in latin sinister means left dexter means right
Left - for the whole of the UK.