Thank you all very much.
You're a very helpful (and knowledgable) bunch.
I've spoken to the garage and they're replacing the clutch later this week and I'm free to go and re-test drive the car if I'd like to at the weekend. I really like the car so I'm tempted to do so and see if they've fixed the problem.
I'm off to do some more brushing up on my landy research!!
Well done you!...test drive, ask LZ if you think theres a problem, report back to garage explaining the problem to them, garage sort it, you buy it if you want to ...thats how to do it!
Also have a look underneath and make sure there are 2 prop shafts with the vcu between them ..it may have been converted to front wheel drive only - hiding what maybe an expensive vcu / rear diff fix, have a search about it on here