Aternator finaly turned up - apparently DHL couldn't find us on Monday so the brought it Wednesday without any further instructions - strange.....
Anyway its fitted now and charging, so all is well. Had to drop it out the bottom with the guard removed and refit the same way. Needed to drop the bottom rad hose too to get it out. May be different on a truck without body lift so not much point me taking photos or doing a workshop download - it could well come out the side or whatever. Job is a lot easier with the battery completely removed though regardless of body lift.
Also refitted the sump guard properly (back been on cable ties for about a year now). Drilled out snapped bolts, retapped and replaced the fittings with stainless cap heads (Allen bolts) all copiously coaed in copper grease.
I fancy a quick trip out over the weekend then I'm going to give her a good clean up and polish - yikes never done that on this one, ready for sale all being well.