In 2015, Havering Council had a Christmas tree recycling program. Currently we have not heard word of what it will be this 2015, but I am assuming it will be pretty much the same.
No one wants to see Christmas trees fly tipped or floating down the Thames. You can check out the current facilities that Havering Council offer here and if you find yourself in London check out this web page.
You can also find out about Essex Christmas Tree recycling.