Having been a bee-keeper for decades here in the western U.S. studies and our own bee keeping experience shows that there's very little difference between various honeys. Color and minor taste variations are caused by the various flowers from which pollen is transported back to the hives.
There is, however a great deal of difference between 'raw honey' and ultra-refined honey. The phytonutrients found in raw honey exceed those that are found in the ultra-refined ones. Ultra-refined honey is subject to heating and some water injection to make it "pretty". If the honey you are buying, even in the U.K. is clear it's heated during the refining process. If it's cloudy, it contains more pollen, hence the additional benefits.
We, at home, never eat or cook with anything but "comb honey". It still is in the comb just as taken from the hive supers. But, comb honey can be spun in the centrifuge to only remove the bees wax and one will still benefit from the raw honey...