Buying or selling future fx contracts

Hi sir

If the spot rate is given as $/£1.5 and we are due to pay $2.3m in 6 months

I would assume that we need to buy now and sell later, as we are worried that the rate will increase, fair enough

But if the futures contracts are quoted as £/$, eg the inverse of the rate above, how do we deal with this when calculatin the lock in rate??

I assume we need all rates to be quoted in the same order eg $/£ or £/$??

Thanks