Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
25
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£899 to £1,199
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is natural fillings at a mid-range price. Wool gives a soft, cushioned surface, flax adds breathability, and cotton wicks away moisture, which means the sleep surface stays cooler than a foam-topped alternative. If you're a hot sleeper, that combination matters. Underneath, 2,500 pocket springs work independently of one another, so you get pressure relief where your body needs it and less disturbance from a restless partner. The medium firm tension suits most back and combination sleepers, although lightweight side sleepers may find it a little too firm at the shoulder. Yes, £899 is real money, but the traceable wool and NBF-approved manufacturing give you a clearer idea of where that money goes.
Key Features & what's inside
- Cover. A breathable Belgian damask fabric cover. Damask is a woven fabric rather than a stretchy knit, which means a slightly more traditional, supportive feel on the surface.
- Wool. Wool filling gives a soft, cushioned feel and suits sleepers who prefer a traditional, natural mattress. It's also naturally temperature-regulating, so it helps in both winter and summer.
- Flax. An organic, absorbent, light fibre that enhances breathability. In practice, it helps air move through the upper layers so heat doesn't build up around you.
- Sustainably Sourced Cotton. Highly breathable cotton fibres provide a fresher, cooler sleep surface and wick away excess moisture. It's responsibly sourced from trusted suppliers, which fits the mattress's natural credentials.
- Pocket Springs. Each spring sits in its own fabric pocket, so they move completely independently of one another. That means better pressure-relieving support and less motion transferring across the bed when a partner moves.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
If you love the sink-in, contouring hug of memory foam, this traditional pocket spring feel will seem quite different, and possibly too springy. Lightweight side sleepers may find medium firm a touch too solid for their shoulders and hips. There's also no UK Single size listed, so it won't suit single bed frames.
Harrison Spinks Derby 2500 Mattress
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How firm is the Harrison Spinks Derby 2500?
It's a medium firm mattress. That tension suits most back and combination sleepers, giving support without feeling like a board, although lighter side sleepers may find it slightly too firm for comfortable pressure relief at the shoulder.
How many springs does the Derby 2500 have?
It has 2,500 pocket springs. Each one sits in its own fabric pocket and moves independently, which means the mattress responds to your body's shape and reduces the ripple effect when someone else in the bed moves.
Does the Harrison Spinks Derby 2500 come with a guarantee?
MattressNextDay's listing states a Harrison Spinks 10 year guarantee. As this appears on a retailer's page, it's sensible to confirm the guarantee terms with whichever retailer you buy from before ordering.
Is the Derby 2500 good for hot sleepers?
It's a reasonable choice. The wool, flax and cotton fillings are all breathable natural fibres, and the cotton wicks away excess moisture, so heat is less likely to build up than with a foam-heavy mattress. No mattress can promise a cool night, but the materials here work in your favour.
What sizes does the Harrison Spinks Derby 2500 come in?
It's available in UK Double, UK King and UK Super King, priced from £899 to £1,199 depending on size. There's no Single or Small Double option listed, so it won't fit smaller bed frames.
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