Managed to loose an inch of my skeg (don't actually recall hitting anything) and found skeg guard which is essentially a stainless replcament skeg that bolts on top of existing skeg.
Seems to be 2 varients of this - Skeg sheild (from same people that make Keel shield) - http://www.keelshield.com/skegshield.html
and another one called Skeg Guard http://www.boatboys.com/skeggard.htm
At approx £70, it's probably close to cost of getting skeg welded (by time lower unit is shipped to repair shop etc).
Has anyone used skeg-guard / skeg-shield? Any opinions?