It is always bad when we buy products that are not what we expected. This is especially true when the product is of high value. I would suggest that all manufacturers, of all products, have some degree of "Friday afternoon specials". I think is is a positive thing when there are issues with products that people know about others experiences. That goes for good products and services too.
You appear to have had the bike for over 2 years now and I can guess how frustrating this must have been. I can also sense that there is a similar level of frustration with the Dealership and Yamaha UK. I would be feeling the same.
That said, you did initially come on to the forum for some help, telling us a little about yourself. You then have left it for over 2 years to return; and it does appear that this is to communicate your frustration with this bike, the dealer and the marque. I think the saddest thing is it looks like you like the bike but have been extremely disappointed with the quality and service you have had.
I do think that you have slightly misunderstood the meaning of the forum, when used in this context. It is a place for people to come and voice there opinions; a place to ask for help; to help and; to generally socialise. We do have rules and expect a degree of netiquette and I would guess that a lot of people will have a personal bias based on the input of others and, even what bike they ride.
Good luck with you biking endeavors for the future.