Sell it
Facebook Marketplace Gumtree and eBay local collection all work well for furniture in usable condition. Price realistically and insist on collection because delivery kills the saving.
Donate it
British Heart Foundation Sue Ryder Emmaus and most local hospices collect furniture free of charge. Upholstered items must carry the original fire safety label or they cannot legally be resold so check before you book a collection.
Recycle or dispose properly
Household waste recycling centres take furniture free in most areas though some require a permit for vans. Councils run bulky waste collections for a modest fee. If you use a private clearance firm check they hold a waste carrier licence because under the duty of care you remain liable if your waste is fly tipped.
Give it away
Freecycle Freegle and Olio move furniture quickly when you simply need it gone. Listing it a fortnight before the move gives enough time for a collection to be arranged.
In short
Start early sell what has value donate what is usable and always check a clearance firm's waste carrier licence.