The car thing is copied from the highway code clearly and yes the "if possible" bit needs to be removed.
The problem is the highway code recommendation in text form only is unclear, the photo clarifies but is it the words that matter?
"You should...give motorcyclists, cyclists and horse riders at least as much room as you would when overtaking a car (see
Rules 211 to 213) and
214 to 215)."
So is this pass the cyclist as close as you would another car (most people pass other cars closely in cars,)
or
Instead of the cyclist imagine a car and overtake accordingly (as the photo suggests)
In my opionion the law needs to be changed to a must and the distance needs to be clarified as it stands there is effectively no specific rule that prohibits close passes.
212 says
When passing motorcyclists and cyclists, give them plenty of room (see
Rules 162 to 167). If they look over their shoulder it could mean that they intend to pull out, turn right or change direction. Give them time and space to do so.
Again "plenty" is subjective and no "must" this is an advisory not a rule.
213 says
Motorcyclists and cyclists may suddenly need to avoid uneven road surfaces and obstacles such as drain covers or oily, wet or icy patches on the road. Give them plenty of room and pay particular attention to any sudden change of direction they may have to make.
Again "plenty" is subjective and no "must" this is an advisory not a rule.