Teaching counter-steering was actively discouraged for many years by the DSA. AFAIK, it's now 'teach if you feel you have to because the trainee's not getting round bends' but from chatting with instructors whether you get criticised on CBT seems to depend on the attitude of individual local examiners.
On an organisational level, they held a conference - oh, must be 12 or more years ago now. I got a call from a chap called Terry Friday who was a former Kent Police bike instructor who was the Driving Instructors Association motorcycle rep, so he was going. "You seem to know a lot about this counter-steering!" (He'd been reading my Q&A on the topic on my site www.survivalskills.co.uk) "So what do I need to know?"
So we spent 20 mins going through 'push right, go right', and 'push hard, turn faster' and he rang off.
A couple of nights later, he rang back.... "It works doesn't it?".
So there you have an ex-police instructor and rep for the premier organisation for trainers, and he didn't know about counter-steering.
He rang me back a week or so after that to tell me that North Wales police had given a presentation which was firmly against teaching counter-steering as "it's too complicated for learners". This conclusion was based on their investigation of a fatal crash which happened when a rider was under instruction on counter-steering and lost control on a corner.
So there you have it. For years the police steadfastly opposed it, and if you check the various editions, you'll find it only gets a mention in the newest edition of Roadcraft - and even then they didn't get it quite right.
I wouldn't say there's 'much need' but it really powers up a swerve - I teach the techniqu e on my Performance:SPORT course, not as an everyday technique but as something you might use to swerve hard, or to tighten the line mid-corner.Incidentally, I've only found that weighting the legs made a significant difference on track. At regular road speeds, I haven't found much need for it. Am I the only one?