I didn't see any mention of a distinction between demo units and any other sort of unit, just that I should get the same ability to inspect as if I'd gone into a shop. You added lots of words to pad out your assertion but i don't see where the distinction is made clear in consumer law.
I don't mean this provocatively but it sounds like you have an online shop or something and are quite defensive in favour of the rights of the business.
Distance selling rights are different for a good reason, so that consumers don't end up with products that are unsuitable. For the elderly or disabled (I am neither) in particular, they need to be able to buy in confidence without having consumer law thrown at them when a product is genuinely unsuitable.
Returns are a part of business and should be treated as a cost of doing business.
I don't mean this provocatively but it sounds like you have an online shop or something and are quite defensive in favour of the rights of the business.
Distance selling rights are different for a good reason, so that consumers don't end up with products that are unsuitable. For the elderly or disabled (I am neither) in particular, they need to be able to buy in confidence without having consumer law thrown at them when a product is genuinely unsuitable.
Returns are a part of business and should be treated as a cost of doing business.