In reply to Sl@te Head:
From the government advice:
"Can I travel to do sports outside my local area?
If your preferred form of exercise or leisure is one that can only be undertaken in specific locations, this still needs to be carried out locally. Examples of this might include golf, angling or watersports. If there is a place where you can do these within your local area, then you are free to do so, but it would not be permissible to drive outside your local area for these purposes."
It goes on to say more, but I read that as travel within the 5 miles (what local refers to) is fine. I'll be driving to climb some days, but I'm quite enjoying biking and walking there at the moment.