How many miles since the short block replacement? It was only done two years ago, and if it was a Toyota warranty job done at a Toyota-approved dealer, then the timing chain failure should at least be partially covered.
A new chain should have been fitted when the block was changed. It sounds like it wasn't, or the tensioner mechanism wasn't.
Yes, chains can fail at any time, but as it's apparently less than two years after a complete manufacturer-approved engine rebuild, you should get some contribution from Toyota or the dealer.
Assuming you've kept up the servicing schedule, I'd take it up with Toyota UK if the dealer won't budge.
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