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)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
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 this price.
Key Features & what's inside
- 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.
Who's it NOT for?
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 at £1,199 to £2,299, so budget-focused buyers should look elsewhere. Fans of memory foam contouring will not find it here.
Harrison Spinks Platinum 12500 Pocket Mattress (Medium Feel)
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 this 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.
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