Re: SOP
That's because "consumer rights"* of at least the phone call or credit card request to "return and refund". So yeah, they do that check (plus selling opportunity for the other £100k off sound and cinema equipment, minibar and hotdog machine).
A business though, you sign the contract, and you don'ts gets to returns.
*Depending on country, but AFAIK even America has chargeback on credit card purchase returns to store.