GBP/JPY Hedge with Futures

Anyone know if it is possible to do a 100% hedge of the GBP/JPY (long on the forex side) using Futures (to cover the short side), and how?

No, it won't work because the futures price carries a premium that incorporates the interest rate as a carrying charge so that it will lose the amount os the interest over the holding period

I do not think there are any furtures available on JPY against GBP.
JPY futures agaist USD does exist on CME Globex and you can use it as a hedge for USD/JPY spot which carries the same interest as GBP/JPY at present.

Remember that you should go long on both the spot and futures as the spot is USDJPY but the futures contract is JPYUSD, you have also to balance the number of futures contracts and number of lots for spot, they are not 1 to 1.

After all these the futures premium as mentioned in the previous post does exist and perishes as the contract approaches its expiry.