Once the festivities are over, you can take your real Christmas to be recycled at one of Croydon's Household Reuse and Recycling Centres. You can also have it collected for free. Remove all the decorations and place your tree as close to the boundary of your property as possible, making sure that it is visible from the pavement, without blocking access or the pavement. They will be collected ASAP from Monday 9th Jan onwards.
If you subscribe to garden waste collection service you can also cut it up and put it in your garden waste bin.