I don't have the receipt
Here's a response I received from @sharafdg in relation to a faulty electronic item for which I had lost the receipt for:
Is Sharaf DG's response correct? I don't think so. It is my understanding that you do not lose your consumer rights if you lose your receipt. A receipt is a proof of purchase and is useful for confirming you have purchased a certain item from a particular store. If you don't have your receipt you could perhaps produce another proof of purchase such as a bank statement or credit card slip. Indeed, some retailers, may not insist on you providing the original receipt.
Just to support my understanding that you do not lose your rights if you lose your receipt see the following link to the famous UK consumer rights campaigner Which?
Here's an extract from that link: