Head Re-build

Way back when I bought the donor the previous owner warned me that one of the spark plugs was 'slightly rounded off'...
When I tried to get the plugs out it was clear it wasn't slightly rounded off, but completely and utterly rounded off.
As my attempts to get it out failed I ended up buying a spare head off ebay.
I got it several months ago and it's been sat under my desk at work.  Every now and then I've been getting it out during a spare lunch hour and slowly rebuilding it:

It's now finished with new stem seals and re-ground valves and seats (done the old skool way with grinding paste and a sucker on a stick) and ready to go on the engine.