The FV function calculates the future value of an investment based on an interest rate.
So for example, say you wanted to see what a £1000 starting balance looked like after 10 years at 5% interest per year you would write.
=(FV(5%,10,0,-1000))
Which gives a total of £1,628.89
Or say you have a £1000 starting balance, you're depositing £100 every month, and expecting interest to compound every month for 120 months you could write
=(FV(interest_rate / 12, months, monthly_depoists, starting_balance))
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=(FV(5%/12,120,-100, -1000))
Which gives a total of £17,175.24
Plugging in your numbers, to see your balance in 27 years time we could write
=(FV(12.01%,27,-18000,0))
Which gives you a total of £3,053,907.38