[Gremlin]

Undercutting may be allowed when traffic on the right is moving slowly or turning right but! You must be in a marked lane and not squeezing up the gutter or scraping the near side of cars.
Having driven long articulated HGVs for many years I found cyclist a nightmare when I was turning left and would always treble check all mirrors if any cyclist were in the vicinity.
The reason side guards were fitted to trailers was to knock silly cyclist out of the way rather than squash them under the trailer wheels.
I've passed defensive driving and advanced HGV driving tests and last week a speed awareness course and cyclist were always on the agenda but never on a course which would give them some idea of what a HGV driver has to put up with in heavy traffic with cyclist weaving in and out.