Millbrook Smooth Tech Luxury 5000 Pocket King Size 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
£1,719
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Millbrook Smooth Tech Luxury 5000 Pocket Mattress
More available sizes
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
- 75cm each for two sharing: Two people sharing get 75cm of width each, which means you can turn over without negotiating for territory in the small hours.
- Less disturbance on different schedules: The mini pocket springs reduce motion transfer, so an early alarm on one side is far less likely to wake the person still asleep on the other.
- 200cm of length for taller sleepers: At 200cm long, the UK king gives taller sleepers room to stretch out fully, with feet on the mattress rather than hanging past the edge.
- Edge support that opens up the full width: Butterfly springs and a rod frame firm up the border, which means you can sleep right at the side and actually use all 150cm.
- Natural fillings across a wider surface: Wool, silk, cashgora and cotton breathe well, useful when two bodies, and sometimes a dog, are sharing one sleep surface all night.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially with one of you getting up hours before the other. It also suits couples where one partner is approaching six foot, since the 200cm length is a genuine upgrade over standard sizes. If the dog has a permanent spot at the foot of the bed, the extra width absorbs that too.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king. In that case we'd recommend the UK double instead, which still sleeps two and needs a smaller room, at least 2.6m x 2.8m by our guidance.
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FAQ's
Is the Millbrook Smooth Tech Luxury 5000 in a UK king big enough for two?
Comfortably. At 150 x 200cm, two people sharing get 75cm of width each, and the reinforced edges mean the full width is usable rather than lost to a soft border. The mini pocket springs also cut motion transfer, so the extra space translates into genuinely undisturbed sleep rather than just more mattress.
What room size do I need for the Millbrook Smooth Tech 5000 in a UK king?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m feeling comfortable. That allows walking space on both sides and room to open drawers or wardrobes. New build master bedrooms can be tighter than they first appear once furniture goes in, so measure with the wardrobes accounted for, not the empty room.
Is a UK king worth it over a double for this mattress?
For couples, usually yes. The UK king is 15cm wider than the UK double, which works out at 7.5cm more each for two sharing, and it's 10cm longer too. That extra length matters more than you'd think if either of you is tall. If your room can take it, the UK king is the more comfortable long-term choice.
Does the Millbrook Smooth Tech Luxury 5000 come in a super king?
No. Sizes for this mattress run from UK single up to UK king, so the UK king at 150 x 200cm is the largest option. It's the same 200cm length as a UK super king, just narrower, so taller sleepers lose nothing on legroom by choosing it.
Will a king size stop me waking my partner on this mattress?
It helps on two fronts. The 4000 mini pocket springs reduce motion transfer, so getting up early or shifting position sends less movement across the bed. Then the width does the rest: with 75cm each, you're simply further from each other's fidgeting. No mattress removes disturbance entirely, but this combination gets close.