Millbrook Smooth Tech Luxury 5000 Pocket Small Double Mattress
The Millbrook Smooth Tech Luxury 5000 is a pocket spring mattress with a medium feel, handcrafted in the UK and filled with natural materials: wool, silk, cashgora and cotton.
- Mini springs ease pressure points
- Minimises partner disturbance
- Wool, silk & cashgora stay breathable
£1,028
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Millbrook Smooth Tech Luxury 5000 Pocket Mattress
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Last seen for £2,974 at Mattress Online on 25th June 2026
Mattress details
Mattress
Millbrook Smooth Tech Luxury 5000 Pocket Mattress
Size
Firmness
Medium Soft
Construction
Pocket Spring
Wool
Depth (cm)
30
Layers
4
Layer Details
Comfort fillings
A blend of wool, silk, cashgora and cotton, which means a breathable, temperature-regulating sleep surface. Natural fibres like these tend to wick moisture better than foam.
Mini Pocket Springs
4000 mini pocket springs sit near the surface for added comfort and pressure relief. They also decrease motion transfer, so you feel less of a partner's movement.
Pocket Springs
1000 traditional pocket springs, each enclosed in its own cloth pocket. They respond independently to movement, which means support that follows your shape rather than pushing back as one unit.
Border reinforcement
The edge is reinforced with butterfly springs and secured with a rod frame. That means firmer edge support, useful for sitting on the bed or sleeping close to the side.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Real space for one: At 30cm wider than the UK single, a solo sleeper can shift position freely on the 5000-spring surface without meeting the edge.
- Fits compact rooms: It's 15cm narrower than the UK double, which can be the difference between a door clearing and a room feeling squeezed.
- Edge support matters more at 4ft: Butterfly springs and a rod frame reinforce the border, so sleeping close to the side of a narrower mattress still feels stable.
- Comfortable for occasional sharing: The 4000 mini pocket springs reduce motion transfer, so a couple staying the odd night won't disturb each other on the shared width.
- Natural fillings in a guest-friendly size: Wool, silk, cashgora and cotton regulate temperature, a plus for guests whose preferences you can't predict.
This size suits you if...
You sleep alone and want more width than a UK single without giving up a compact bedroom, you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly, or you're downsizing and the new room won't take a standard double. Allow at least 2.4m x 2.8m of floor space, which is our suggestion rather than Millbrook's.
Consider another size if...
You share the bed every night, since a 4ft width is tight for two long term. We'd recommend the UK double instead, which gives 67.5cm each for two sharing; allow at least 2.6m x 2.8m for it.
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FAQ's
Is a small double Millbrook Smooth Tech Luxury 5000 big enough for a couple?
For occasional nights, yes. The mini pocket spring layer keeps motion transfer low, so a visiting couple will sleep comfortably. For every night, a 4ft width is a squeeze for two adults, and we'd point you towards the UK double, which gives 67.5cm each and needs a room of at least 2.6m x 2.8m.
What room size do I need for the small double Millbrook Smooth Tech 5000?
We suggest at least 2.4m x 2.8m, and that's our guidance rather than the manufacturer's. It leaves enough clearance to walk around the bed, open drawers and rotate the mattress, which this model needs. In a box room or loft conversion, measure at mattress height too, since sloping ceilings can steal usable space.
How much wider is the small double than a single in this mattress?
The UK small double is 30cm wider than the UK single, and both are 190cm long. That extra width is the whole point of the size: a teenager who has outgrown a single, or an adult who likes to spread out, gets noticeably more room without the footprint of a full double.
Will standard double bedding fit this size?
You'll need small double (4ft) fitted sheets, since standard double sheets will bag on a 120cm-wide mattress. A standard double duvet works fine on top, with a little overhang each side. 4ft is a standard UK size, so sheets and frames are easy enough to find, if slightly less common than double.
Should I size up to the UK king instead?
Only if the room allows it. The UK small double is 30cm narrower and 10cm shorter than the UK king, which gives 75cm each for two sharing and needs a room of at least 2.7m x 2.9m. If you sleep alone in a compact bedroom, the small double is the more sensible fit.