Harrison Spinks Platinum 12500 Pocket Mattress (Firmer Feel)
Mattress
Harrison Spinks Platinum 12500 Pocket Mattress (Firmer Feel)
Size
Firmness
Firm
Construction
Depth (cm)
29
Layers
6
Layer Details
- Comfort fillings. Layers of plush British wool sit at the top, which means natural temperature regulation. You should feel cosy in winter and cooler in summer.
- Comfort fillings blend. Cotton and wool fibres are blended with hemp and flax. These tougher plant fibres help the comfort layers keep their shape over time.
- Ecotex layer. A layer of Ecotex fibres made from recycled materials. It adds strength and durability rather than a feel you'd notice directly.
- Mini Pocket Springs. Layers of 10,500 mini springs contour to your body. Because each spring moves independently, the surface adapts to your shape for a more personalised feel.
- Posturfil springs. An additional 1,000 Posturfil springs respond to your movements and how your weight is distributed. In practice, this means flexible support that adjusts as you change position.
- Cortec Quad Revolution springs. The base layer of 1,000 Cortec Quad Revolution springs adapts to your body for deeper support. Each one has a mini spring inside it, so you get two stages of response from a single spring.
Layer details from mattressonline.co.uk product page, September 2026.
- A shared size that fits most UK bedrooms: At 135 x 190cm (4ft 6in x 6ft 3in), the UK double leaves space for wardrobes and drawers in a typical British room.
- Bedside tables on both sides: In a room around our suggested 2.6m x 2.8m minimum, a UK double usually still allows a table each side, which a UK king often rules out.
- 12,500 springs across the shared surface: Each spring moves independently, which means one of you shifting position is less likely to disturb the other.
- Wool fillings for two body temperatures: Sharing a bed adds warmth, and the British wool layers regulate temperature so neither of you should overheat.
- A generous guest room option: For visiting couples, the UK double is the accepted standard, and bedding for it is stocked everywhere at every price.
This size suits you if...
You share the bed every night and want the traditional couples' size, your bedroom sits at or above our suggested 2.6m x 2.8m minimum for a UK double, or you're furnishing a guest room that regularly hosts couples and want natural fillings rather than foam.
Consider another size if...
You and your partner both like room to spread out, since 67.5cm each for two people sharing is snug for restless sleepers. If your room allows at least 2.7m x 2.9m, we'd recommend the UK king instead.
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Is the Platinum 12500 in a UK double big enough for a couple?
Yes, although it's the traditional rather than the generous choice. Two people sharing a UK double get 67.5cm each, and the 12,500 independent springs help mask a partner's movement. If either of you is tall, note the UK double is 10cm shorter than the UK king as well as 15cm narrower.
What room size do I need for a UK double Platinum 12500?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows the door to open fully and, in most layouts, a bedside table on each side. Our room guidance is Mattress Unboxed's own, so treat it as a starting point and measure your actual walking space.
Will the UK double Platinum 12500 get up narrow stairs?
It's a deep 29cm pocket spring mattress with natural fillings, so it flexes less than a rolled foam mattress. In older terraces with turning stairs, or tight new build landings, measure the awkward corner against the 135 x 190cm footprint before ordering, and check the retailer's delivery access guidance.
Should I choose the Platinum 12500 in a double or a king?
The UK double suits rooms where a bigger bed would dominate; the UK king is 15cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m for it. If you share every night and the room allows a UK king, the extra width is usually the better long-term buy.
Where can I buy the Platinum 12500 in a UK double?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so it's worth checking back if you're not buying immediately. Stock and delivery timescales vary by retailer, and this mattress is handcrafted in the UK, so lead times can be slower than rolled alternatives.