If you have a Sparks card, you can probably get 20% off most non-food spend - although you do need to visit your Sparks account and add the offer.
If you don't have a Sparks card, try the codes below
9SCV-VLWW-2G4B-MMZH
9SBF-BV8Y-FBCH-MM8V
Expire 22 May. I think these are single use.
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- Marks and Spencer 20% codes, expire 22 May