It doesn't surprise me that horses may behave in one way at a dealers yard when in full work with professionals riding, and then their behaviour changes once in a novice riders hands.
True enough - but I imagine that Safecobs, by their own use of a grading system of suitability, very often ARE selling as suitable for a novice thereby giving the novice a false impression of how the horse might be when it has left their yard and is being cared for and ridden by the unsuspecting novice.
I actually know someone who did buy of them a supposedly 'safe for a novice' cob. Perfect when they tried it and were given all the right assurances. Within a week it was a true nightmare on the ground and ridden, dangerous to say the least, they persevered for a few weeks, expecting it might settle down - it did not. With a little snooping I was able to find out some of it's very recent past over here in Ireland before it was sold over to the UK- not a single thing they had been told about the horse was true, including its extremely suspect temperament and even difficult and unpredictable when ridden by a professional.
The real difficulties arose when they tried to get a refund or exchange - not a hope in hell from these supposedly reputable dealers of safe cobs.