There are a few ways to look at it this -
1) If you can get the local council to consider it as a "domestic waste" they are legally bound to dispose of it for you as bulky household waste.
However they are allowed to charge your for the collection of it. The waste hull would need to be "produced" at your house for this to work.
2) The other one to pursue take to a waste transfer station or landfill site yourself. DO NOT JUST TURN UP - ring them and negotiate price before hand. (Current landfill prices are about £40/tonne with a contract and a skip to a transfer station is gonna be £150ish). However you may not be able to take it to a landfill as all waste must be pre-treated "if it technically feasible" leaving you just a waste transfer station option.
Burning it is not a good idea.