If you are a British citizen, you can buy gold (and silver ) sovereign coins that are exempt from capital gains tax . With this amount of , there is No need for margin/leverage trading.
"Capital Gains Tax is exempt on all British legal currency. This includes Gold Britannia coins , Silver Britannia coins, Gold Sovereigns, Silver Sovereigns. This means you can make an unlimited tax-free profit on investments of any size and value on ALL of these British legal currency bullion coins."
Trade on your own judgement. This is just to help you put the picture together and figure out what you might want to do when the deadline approaches.