I am seeking closure with this question guys.
I am aware of various sources of free elevation data ~30+ m, and I have been searching for higher resolution FREE data for a while now. This already exists somewhat (Where to acquire elevation data for UK?), but may have changed since a year.
I'm afraid I may know the answer already, but to put an end to my misery and false hope:
What is the highest resolution, freely available (outside of academic institutions), elevation data covering the ENTIRE UK? - is 10 m available?