The other way of increasing your margin is maxing out on your credit card. You had £2000 which now has the power of £200 so you need to increase it by £18000. If your credit history is fine then you could split the £18000 across say 3 cards. Currently some cards are offering 6% Apr so that equates to 0.5% on the amount every month. Also you would have to price in the 3% fee on the first month so possible £720. You would have to pay off 2% of this amount monthly.
P.S. the above is not recommended except for the gamblers out there!