I got some spares for my Tilley lamps through the post today. One of the spares that I got was a brass control cock, and in trying to take the knob off the stem, to replace a seal I've managed to knacker it.! I have ordered a couple more of them from a different seller and they've already got new seals fitted.! I did manage to fettle Sam's old pump so that it's now fully working, I've just got to restore the plunger handle as the aluminium is a bit corroded.
The control cock was for the wrong model anyway, so it will be going to @podbros to see if he can fettle it back to life. I didn't read the listing for the other valve fully, and it's just one I'll be getiing... Oh well, I only need one, and it still works out cheaper.