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Terms requiring that the goods are accepted as satisfactory on
delivery, or imposing unreasonable conditions on their return.
Consumers have a right to a reasonable opportunity to examine goods
and reject them if faulty. In the case of complex goods, a reasonable
opportunity to examine means a chance to try the goods out.
Consumers cannot legally be deprived of this right by being required to
sign 'satisfaction' notes on delivery, or by being required to return
goods in a way that may not be possible – for example, in disposable
packaging that they are likely to discard after opening.
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From page 19 of this:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/284426/oft311.pdf