+1 on getting some new oil and filter in the new vehicle. It's dead easy, and would probably take longer to drive to a garage to have it done. Once the new oil is in then you can gradually work through the other fluids and filters that could do with doing. All for a lot less than it would cost a garage to do it, and with the knowledge that you have done a decent, caring job too.
As others have said, check the condition of the VCU, and if the rotation is too slow doing the test, just take the propshaft off temporarily*, (not difficult), and get a recon VCU from somewhere reputable like Bell Engineering. It will cost you about £275, but you will be good to go in that department for a good few more years. Tyres yes, these are important too, and must be inflated to the same pressure, and be matching, (when the propshaft is on). *theoretically you should tell the insurance if you remove the propshaft. If it has already been removed, don't fall for the 'fuel economy' story. It's probably been taken off to hide an expensive IRD repair. So just walk away.
When I got my 3 door hippo just over a year ago, it got to the point where I had to travel a good distance to find one in budget and in decent cosmetic condition. There were a few things I didn't like about it still, but it was much better than many I had seen. No secondhand vehicle is going to be perfect, and you just have to accept that there are things that will need doing as time goes on. (hopefully not all at the same time, and not all expensive ones too!).
This site is great though, because just about every common problem that occurs on these vehicles has been discussed and there is a wealth of expertise and experience on most matters. There are some true stars on this forum that take the time, to chip in their experiences. For which I've been, and have seen other be very grateful for. Don't be put off by number of posts on here talking about all sorts of problems. Remember, people usually only come onto a forum when they have a problem to solve. So it looks worse than things really are. Freelanders are great vehicles, they are quite capable, and offer comfort, and for a 4x4 are reasonably economic to run. They just need some basics like the VCU and tyre importance to be understood, (something lots of garages don't), and with a bit of care, should serve you well. I would say that if you want to keep running costs down, get into the mindset of taking on some of the jobs yourself, for there is a ton of information at hand to help you).
Regarding your vehicle, when you go back give it another once over, check the cubby box in the boot, to make sure it is not wet or has water stains in it, (an indicator a failing door seal), check all the electrics work, including the windows. Under the bonnet, are the hoses in good nick, how old is the battery, are there any cracks on the round coolant reservoir? Generally just look at things like the tyre type / condition, exhaust, brakes etc., and if anything is amiss, you can always try chipping them down a bit more to secure the sale, telling them that you are going to have to spend money straight away to sort it. The real deal breaker would be a missing propshaft. Most other things are sortable at reasonable expense, but if you can spot these before you buy, it's the time for getting the seller to help you cover the costs of the things you spot, by way of them reducing the cost a bit.
Hope this helps!
Jim