Harrison Spinks Platinum 12500 Pocket Mattress (Medium Feel)
The Harrison Spinks Platinum 12500 is a pocket spring mattress with a soft to medium feel, handcrafted in the UK and filled with natural materials including British wool, cotton, hemp and flax.
- Medium feel with adaptive support
- Warmer in winter, cooler in summer
- Recycled fibres add durability
£1,199
Get the lowest price we've found
The Harrison Spinks Platinum 12500's 12,500 springs come from a layered system that combines mini springs with pocketed Cortec Quad Revolution springs, which means the surface adapts closely to your shape rather than pushing back uniformly. It's 29cm deep and sits at the premium end, although the natural fillings and spring count go some way to justifying that. It comes in five sizes, from UK Single to UK Super King.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
29
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
5
Price Range
£1,199 to £2,299
Best Sleeping Position(s)
Side Sleeping
Back Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress suits you if you want natural fillings over foam. The wool comfort layers regulate temperature, which means you should feel warmer in winter and cooler in summer, a real help if you tend to overheat at night. The spring system is the other draw: 10,500 mini springs contour to your body, backed by 1,000 Posturfil springs and 1,000 pocketed Cortec Quad Revolution springs, so support adjusts to your weight and movement rather than feeling one-note. Recycled Ecotex fibres add durability with a lighter environmental footprint. It conforms to BS7177: 2008 and Harrison Spinks is a National Bed Federation Approved Brand, which offers some reassurance at a premium starting price.
Key features & layer details
Comfort layer
Layers of plush British wool sit at the top, which means natural temperature regulation. You should feel cosy in winter and refreshed in summer.
Comfort layer blend
Cotton and wool fibres are blended with hardwearing hemp and flax. These tougher natural fibres help the comfort layers keep their feel for longer.
Sustainable layer
A layer of Ecotex fibres, made from recycled materials, completes the comfort section. It adds strength and durability rather than softness.
Support system
Layers of 10,500 mini springs contour to your body for personalised comfort. An additional 1,000 Posturfil springs respond to your movements and weight distribution.
Spring system
The base uses 1,000 Cortec Quad Revolution springs, each encased in its own pocket and secured into groups of four. Each of these springs contains a mini spring inside it, adding a second stage of response.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Warm sleepers
Layers of British wool at the top regulate temperature naturally, which means you should feel cooler in summer and still cosy in winter.
Eco-conscious buyers
Natural wool, cotton, hemp and flax fillings sit alongside recycled Ecotex fibres, giving a lower environmental footprint than a foam-based mattress.
Side sleepers
A medium feel with 10,500 mini springs that contour to your body means the surface adapts closely around shoulders and hips.
Combination sleepers
Posturfil springs respond to your movements and weight distribution, so support adjusts as you change position through the night.
Lighter sleepers
Pocketed Cortec Quad Revolution springs each contain a mini spring, adding a second stage of response that suits lighter bodies on a medium feel.
If you prefer a properly firm surface, this soft to medium feel may not give you enough resistance, and heavier sleepers who need firmer support might sink further than is comfortable. It is also a significant spend, so budget-focused buyers should look elsewhere. If you prefer memory foam contouring, you will not find it here.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Harrison Spinks Platinum 12500 Pocket Mattress (Medium Feel)
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the Harrison Spinks Platinum 12500 mattress?
This version has a soft to medium feel, according to the mattressonline.co.uk listing. That makes it a gentler surface than a true medium, which suits side sleepers and lighter builds well, although those who like a firmer feel should note the range is also listed in medium and firm options.
Does the Harrison Spinks Platinum 12500 come with a trial period?
MattressOnline lists a 100-night trial with this mattress. That trial is the retailer's own offer rather than a Harrison Spinks guarantee, so if you buy elsewhere, check that retailer's terms before ordering.
How many springs does the Platinum 12500 have?
It has 12,500 springs in total: 10,500 mini springs that contour to your body, 1,000 Posturfil springs that respond to movement and weight, and 1,000 pocketed Cortec Quad Revolution springs, each with a mini spring inside it.
How long is the guarantee on the Harrison Spinks Platinum 12500?
The mattressonline.co.uk listing states a 5-year guarantee. It's a shorter span than you'll find on some mattresses at a premium starting price, though Harrison Spinks is a National Bed Federation Approved Brand and the mattress is handcrafted in the UK.
How deep is the Harrison Spinks Platinum 12500 mattress?
It is 29cm deep. That is on the deeper side, so check your fitted sheets will stretch to fit before it arrives. The depth reflects the multiple comfort layers and the two-stage spring system inside.
Couldn't find an answer to your question? Send us a message