There are tons of options for you.
Here are 2 examples that have availability for your dates.
-Transfer 105,000 AMEX points to Continental and redeem for travel on Virgin Atlantic's business-class equivalent "Upper Class."
-Trade AMEX points to someone else for AA miles and fly on AA's Flagship First Class suites for 125,000 miles.
Both have lie-flat beds, but AA's suites will be roomier.
Note that when redeeming miles for premium class travel to the UK you will be slapped with a UK luxury tax. Expect to pay about $200 in taxes on such a redemption.