Deal verdict
Both have been cheaper. It's worth waiting on either.
The Sealy Harlow Ortho Plus Mattress costs £80 less today.
Mattress Online
Worth waiting
£429 Double
It's been cheaper. It was £374 on 13 Nov 2026. It's been £429 or less for 100% of the 33 days we've tracked.
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Dunelm
Worth waiting
£509 Double 4ft 6 · Pocket sprung
It's been cheaper. It was £409 on 13 Nov 2026. It's been £509 or less for 100% of the 89 days we've tracked.
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| Sealy Harlow Ortho Plus Mattress | Dorma Natural 2000 Pocket Sprung Wool Mattress | |
|---|---|---|
| Firmness | Firm | Not stated |
| Warranty | 5 years | 20 years |
| Mattress type | Not stated | Pocket sprung |
| Sizes | Single, Small Double, Double, King, Super King | Single 3ft, Small Double 4ft, Double 4ft 6, Kingsize 5ft, Super Kingsize 6ft |
Specs are the figures each retailer publishes. Prices are for the size shown above.