Even if I dont live in the UK, heres my input on this.
On the face of things, a 1,6C rise in temperature does not seem a lot. Here, its made noticable changes. 30 years ago, Hydrangeas could not be grown, as they froze. Now, they grow quite well. 15 years ago, Quince could not be growwn here as it was too cold. Now, they do reasonably well, and I usually get a good crop. Obviously, the local growing season is short.
@Anniekay made a good point. The winters do seem to be getting colder, and the Summers warmer. It also seems that there has been a kind of "shift" in the seasons. There does not seem to be Spring or Autumn anymore, just Summer and Winter. Years ago, the motorbike riding season started at the beginning of April, annd finished at the end of September. Nowadays, its May to October.
I'm in agreement with one thing
@Zigs said. We are coming out of a mini ice age. Think about this. Pre 1000AD. the climate in Greenland was warm enough to allow grain crops to b grown. 100 or so years later, it was too cold.
The only thing that I am certain of is that growing seasons everywhere are changing. Is that all because of a 1,6C degree change?