This turned out to be a long post off at a tangent - whoops!
The second is mere speculation on my part. Does the, well, historical "hierarchical" aspect of UK society help this sort of thing to flourish? Are patients more willing to accept the word on high in the UK - and not question it, even if it raises all sorts of questions? Maybe many UK patients really do go away after this training - because after all, "that esteemed doctor said it was all in my head"?
I'd say generally speaking people in the UK are very aware that shenanigans go on and the voice of authority isn't as well respected as in the past. However, when you have worried sick people who lack all the information and are isolated in their illness their default position will be to trust, certainly to begin with. "I'll try anything". People aren't stupid though and often know when things are wrong. In theory you can change your doctor but that isn't always practically possible. And if your new doctor thinks the same way? they are the gatekeeper to specialists. And if your financial situation depends on compliance?
When people begin to know there are problems they can be at a loss to know what to do about it. Sometimes they don't want to make a fuss (said to be a sterotypical british trait). They complain to friends and family. When they want to take it further there are complaints procedures to be followed which can be daunting, long winded, seemingly transparent but too often actually opaque. With some issues those with the power to effect change can hold out for decades if change doesn't suit them or their 'superiors'.
Sometimes fault is acknowledged in individual cases but it takes a lot to change a whole system. Taking any kind of legal action requires a high degree of proof and is a financial risk. It's all daunting for a sick person who is probably fighting many battles, especially if battles make them more ill.
However, people do organise and challenge; many of us peasants have always been revolting

, and people will/are already about this.
So, many factors. Others countries have their own systemic factors that make things difficult for their patients - perhaps you hear more about ours in the UK?
But how far is it all for those reasons anyway, and how far because in the UK we actually live in the belly of the beast BPS that is spewing out this noxious poison that is infecting everywhere. I don't know.
Good things to think about if it makes us more effective, I suppose.