Isn't there somewhere in the menus to get rid of eco tips altogether? Can't be 100% sure as I know longer have a MK7 but sure there was and I unpicked tgat box. You certainly can in the wife's Polo GTI and my A4.
Yes definitely a legal requirement from the eu and thus a UK law toohttps://www.legislation.gov.uk/eur/2012/65/2012-01-24So not going to be easy to disable and probably a mot fail if its not there