It may depend on your budget, time frame and preference on where to put the tank

For example, we use the full glass tanks as it keeps humidity levels high (which would be suitable for Ventress too!). While they can sometimes be cheaper than the wooden tanks, they can be very heavy.. extremely..and glass is delicate - easy to chip or break the base (getting ours up a spiral staircase was really crazy, wouldn't recommend hauling a large glass tank this way!). You may also need to be careful glass tanks are not placed directly in sunlight as it may heat up too fast in summer.
With the wooden ones, you can seal them before using it. For example, you could use 100% silicone (animal safe, fine with humidity/heat) to prevent the screws from rusting. Ideally you'd want to find a tank that only has visible screws on the outside of the tank. But this is where the time frame comes in - it is possible to get a tub of marine sealer (used for Yachts etc) and use it on all the walls - but it would need to be aired out before putting him in (depending on the brand, could be weeks to months cure time). Arguably once done, it should last a long time.
I see some UK sellers like Swelluk or Vivariumworld that sell tanks for a decent price. Otherwise would going to a reptile expo be of interest for you? If it is, it could be worth renting a minivan for a day and going to a show to pick up a tank in person (the ones we visit in the Netherlands often has tanks with pre-made backgrounds you can purchase on the day). I believe the 'Terraristika' show in Hamm (Germany) is supposed to be the biggest reptile expo in EU. If you decide this would be a fun route - I would try to find some of the vendors before the day and see if you can get one reserved.
Acrylic tanks can be just as clear as glass but much lighter weight. The downside is that they can be scratched easily - and since bluey's have scratchy little feet I don't know how well it'll hold up long term. I've also heard of PVC framed tanks, but can't find resources where to buy them in UK/EU.