Just posting to confirm the accessory belt, water pump and tensioner can all be done without removing the fan and cowl.

The only realy pig being getting the tiny 8mm bolt back into the coolant pipe bracket.

The water pump was a little reluctant to come out but a few blows with some wood and a mallet made it move enough so the seal was cracked.

Car ran squeek free and more importantly coolant leak free afterwards.

(coolant leak symptom, as I couldn't find anything similar on here, was the car would be fine until it cooled down after a trip then it would leak a bit, this was the waterpump seal being OK on a warm engine but no good when it had cooled) 2011 TDV8 Vogue
2007 TDV8 Vogue

I’ve just done the tensioner on the 405…..

Was fiddlier that I remembered doing it on the 322. It’s still pretty straight forwards. It’s doable but frustrating and tighter than it looked.

I just took off the large turbo hose to the throttle body and you can get to all the bolts.  There is nothing that can't be fixed with a hammer😜😜
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I noticed on line a couple of people saying they have alternator failure soon after doing the pulley / belt tensioner etc. but reading through all these, this does not get referenced. I am guessing it is not a definite that you need a new alternator when doing the tensioner job. Just some do if there has been a pull on the alternator due to failing tensioner? Has anyone who has changed the tensioner and left the alternator had plenty of happy motoring after without need to change alternator soon after? Cheers, Ben. 2011 Range Rover Vogue 4.4 TDV8
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Are you guys changing the belt at the same time, or is that a more instruive job? Not sure if possible to get that in with the tight clearance