I think the nude vs non-nude argument could be solved by saying if you are allowed to take things to & fro, then it's only what you could carry - eg in a backpack. So a half ton of gold one way and 100 NOS B&P Speedmasters the other, wouldn't work. I suppose if you had a sprawling family home that was still in your family, then you might be able to somehow acquire a lot of stuff and hide it behind a false wall in an outbuilding that you know hasn't been developed in current times...
But the simplest way to make a fortune would be to take back last week's winning lottery numbers in your head, walk into a shop and buy a ticket with £2, and stash the ticket somewhere, then collect it on your return and claim it legitimately
The fact that lottery jackpots go weeks and weeks without being won must prove that time travel has not yet been invented...
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