We had a similar problem when my dad passed - a local charity took some stuff, other smaller items were gratefully received by a charity shop but there was good stuff (ie perfectly useable and in good condition, but not to the latest trends) that no-one would take and which ultimately ended up at the tip, despite a morning spent phoning round various charities and groups.
Also when we got a new sofa we arranged for a local re-use group to collect the old one on the morning the new one was being delivered. They arrived, and refused to take it on the grounds that "we had a dog" - something that hadn't been mentioned in the phone calls sorting collection, or on their website.
The sofa was clean, only 3 or 4 years old, still had all it's 'fire' stickers, etc but the bloke wouldn't budge as apparently "some people are allergic to dogs". My point that "well lots of people aren't allergic to dogs, the sofa has ben thoroughly cleaned and you could simply ask the question if it's an issue" fell on stony ground and he got back in his van and drove off.
Due to the arrival of the new sofa being imminent we then spent the next hour on the phone but being unable to find anyone who could collect it that day (most were quoting anything up to a fortnight), that also ended up at the tip.