Ok so those codes are fairly simple, at least for the engine anyway.
The T30 one is probably from the battery being disconnected so you can clear and ignore that.
The two secondary air codes are perished vacuum hoses - buy a couple of metres of 4mm braided vac hose and replace those one at a time.
The crank position sensor is simple enough to replace through the left front wheel well. 077905381G, or Bosch 0261210192, about £50. If that fails completely it'll stop the engine running.
You may still need VCDS to see what the ABS is reporting. Not sure whether OBDeleven can do that or not.
It looks quite smart from the pictures so I'd be inclined to fix the niggles and get an MoT on it as that will significantly increase its value.
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