In reply to Jack_F:
> It's probably worth noting that anything more than 15 metres long means I get burnt off hard
Anything less than 15m is bouldering.
Not far from the jura, on the French Swiss border is
http://www.ukclimbing.com/logbook/crag.php?id=1951 and is perfect in the summer. Mind you, most routes are longer than 15m...