I'm not sure if you can see it on the Freebie, but have a look at the pump and see if the clutch is engaging or not. Some LR aircon clutches need a bit of a tap with a blunt object to dislodge them if they've not been used for a while. This is the case in P38s and TD5 Discos but I'm not sure about Freelanders.
There's no point in taking it to a dealer - find a specialist aircon engineer who will be able to do it for a fraction of the price, and will actually know what he's doing. I found a guy who will come out in a van and do it all there and then, he sorted mine out perfectly and saved me loads of money.