my nearside wheel was 200cm from centre line.
Which side of it, there is a 400cm (or more likely 40cm difference (plus width of the line) between one side of it and the other!
Your descriptions so far are as clear as mud.
We know the width you have given for the lane (location on Google and we can measure it)
You've given a width for the car but don't say if hat includes mirrors or not.
You've given a description for the position of your car which can be one of two places.
We've no idea where the cyclist was.
Just throwing out numbers is of little help.
The Guidance is 1.5m, but you can still be convicted of careless driving further away than that if your driving fell below the standard of a careful and competent driver.