In reply to O'Donopoo:
Ethical concerns about Mike Ashley's business practices aside, sports direct do a fairly light carbon fibre/fibreglass pole for £31 a pair.
http://www.sportsdirect.com/karrimor-carbon-walking-poles-784002?colcode=78...
I can't compare to others of a similar style as before that I had the heavy aluminum twist lock type, but they were a real upgrade from that, and after five or six years of occasional hillwalking and hiking, and general abuse getting chucked around the van they're still going strong.