Yen strengthening again, as $/Yen falls from Friday's 117 level. The last few days have seen an almost perfect correlation between the Yen and world stock markets.

Need to trade below 115 i think before we see any significant carry trade unwind concerns.

How do I go about investing in the Yen, obviously I could just pop into the travel agent and buy £10k of Yen travellers cheques, but some hoe I don't think this is either the most sophisticated or economical way to go about it?