It was cut because of recent beheadings of westerners in the news. If any westerners had burned to death in a vat of molten gold, then that might have been cut too.
I'll point out flippant dialog about beheadings were left in, though, which makes the whole thing a bit odd.
I think the intention was good but they should/could have done a better job of it, or maybe just added a warning at the start.
I haven't seen the cut(sorry) footage but it strikes me that it might even have been played for laughs, which might have made it more inappropriate/ or not.
As usual the BBC were in a no win situation.