I'm about to start the last week of my current job as the only IT tech at my school (working term time plus 10 days) on £13k. For my replacement, they've advertised for a Network Manager working full time for £22k-£26k. Even taking into account the loss of school holidays, I'm pretty sure the new person will still be earning more than I was on, despite what my manager and the head tried to tell me - I worked it out to be at least £4k more, although my maths may be off!
I don't really want to kick up a fuss about the situation, but I'm not at all happy about it either... particularly when we were PAT trained and expected to test all the appliances in the school, and my replacement probably won't have that expectation placed on them.