Thanks I'll do all that.
Prior to buying this Discovery I worked on our little Fiat Siecento, again using the Haynes manual. Though a good car it is not good for towing a caravan, hence the new vehicle. I was looking forward to having some room when working around in the engine in comparison to our Seicento. Ho ho, I was wrong! It's more cramped than the Fiat. I tried what I thought was a little thing like checking the auxiliary drive belt, but I gave up on how one gets to that tensioner, trying both the above and below routes, taking things off only to find that they were trapped in place by other components. I don't think that the Haynes is as good as it could be either.
Thanks again.