Clutch or gearbox problem, slighty worried.

Hi there fellow Land Rover owners/enthusiasts.
I've had my 2.5td CSW for a few months now, and the only problem I've come across was today. I'm wondering where the problem would lie.
I was going around scrap yards looking for a project car to possibly do up and at one point was stuck in traffic behind a fire truck on a very steep upwards hill. I held the car in position using the clutch and a little rev (really should have used the handbrake) for a minute or so, then when I tried to move off, I was revving very high but couldn't get much movement. Not unusual from a hill start you might say, but after that when I put it in gear I would get very high revs sounding but very little movement from low gears on flats, accompanied by a worrying burning smell that filled the vehicle. It was as if the gearbox wasn't connecting with the engine properly. This coupled with rattling sounds when moving off in first has got me very worried indeed. Thinking about taking it to a garage, but wondered what the problem would be, and how much people would set you back for fixing it,
Cheers guys

sounds like your clutch friction plate has worn out (the smell would have been the material "burning")

Rattling sounds. Oh dear.

quite, just took it out for a spin (rather fearing for my life) and the clutch seemed fine now, 5 or 6 hours after the problem, took it up and down steepish roads and gears seemed absolutely normal, however when moving off in first I still get about 2 or 3 seconds where it sounds like someone is lowering a drawbridge under my chassis.

yer clutch overheated when u were slipping it on the hill [terribly ferkin bad habit!!!] probably find yer clutch plate surface has started ta separate and disintigrate, possibly one or two rivets churning around in there too. gearbox out, new clutch and pressure plate [do the release bearing too] and learn yer lesson well...dont ferkin slip yer ferkin clutch!!!!!!!

yer held it at the bitin point for a minute or so, no wonder the clutch has burnt out!

as bushtoy ses, u need to drop the gearbox and put a new clutch in, if you can do it yourself it should only cost £60 or so for parts, but if you cant itl prob cost £300 or more for labour.

Thanks for your help guys, can I steal your experience for a moment longer and ask which exact parts I should get? Also where to get them from? I'm really quite ashamed at my lack of knowledge since I'm half way through a university course of automotive mechanical engineering, but I reckon I will be able to install it myself,

yer should be able to buy a clutch kit fer it containing all the bits...

if yer really dun it in good style then you might have to replace the flywheel as well, which wint be cheap

Oh yeah, forgot about this, the follow up was, clutch was fine, and is. Noise was the propshaft, which sheared at the U-jay joint and left me stranded on the A52.
Luckily Steve, a good samaritan who happened to be driving past, arrived a minute later with his fully kitted out Disco and towed me home, showed me how to remove it then how to drive it. Then him and a mate came round a few days later to help me fit a new one (it needed a fair bit of sawing off).
Absolute bloody legend, god bless the green badge.

sounds like a top bloke, hope u bought him a pint!