Millbrook Wool Luxury 4000 Pocket Mattress
Mattress
Millbrook Wool Luxury 4000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
28
Layers
5
Layer Details
- Cover. A soft-touch cotton-viscose fabric infused with M-Pure, a 100% natural, plant-based treatment. It's naturally fire resistant, which means no added chemical fire retardants in the cover.
- Comfort fillings. Luxury Hampshire fleece wool blended with layers of English cotton, traditionally hand-tufted. Wool and cotton breathe well, so this layer helps keep you at a steadier temperature through the night.
- Mini pocket springs. Small, individually cased springs sit near the surface to add comfort and soothing pressure relief. They respond to your shape more precisely than fillings alone would.
- Pocket spring support system. 4000 pocket springs zoned in 7 areas, an arrangement Millbrook calls ErgoZone 7. Each spring is individually encased and adapts to your movement, which means support that follows your body rather than the whole bed dipping.
- Edge support. Metal rods sit above and below the spring unit, held in place with butterfly clips. This reinforces the edges, so you can use the full width of the mattress without the sides sagging.
Layer details from mattressonline.co.uk product page, September 2026.
- More room each: Two sharers get 75cm each, which is 7.5cm more per person than the UK double, enough to stop elbows meeting at the centre.
- Extra length for tall sleepers: At 200cm long, the UK king adds 10cm over the UK double, a real relief if one of you is approaching 6ft and feet currently hang off.
- Less disturbance from early starts: Each pocket spring moves on its own, so if your partner gets up at dawn you're less likely to feel the mattress shift beneath you.
- Usable right to the edge: Metal rods and butterfly clips reinforce the sides, which means the outer part of your 75cm stays supportive rather than sloping away.
- Zoned support across a wider bed: The seven ErgoZone areas run the length of each side, so both sleepers get firmer support at the hips and a little more give at the shoulders.
This size suits you if...
You share the bed every night and have simply outgrown a UK double, or one of you is tall enough that extra length matters as much as extra width. It also suits you if your schedules differ and you want a little more distance between you when one gets up early.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 2.7m x 2.9m once wardrobes are in. We'd recommend the UK double instead, for which we suggest at least 2.6m x 2.8m.
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Is the Millbrook Wool Luxury 4000 UK king long enough if you're over 6ft?
The UK king is 200cm long, which is 10cm longer than the UK double. If one of you is approaching 6ft, that extra length is often the bigger upgrade than the width. The UK super king is the same length, so sizing up beyond the UK king adds width only.
How much space do two people get on a Millbrook Wool Luxury 4000 UK king?
Each of you gets 75cm, compared with 67.5cm each on the UK double, so 7.5cm more per person. Because the edges are reinforced with metal rods, you can sleep near the side without it dipping, so that 75cm is close to fully usable.
Will I feel my partner getting up on a Millbrook king size mattress?
You should feel less than on a UK double. The UK king puts a little more distance between you, and the pocket springs are individually encased, so movement on one side travels less to the other. Across verified owner reviews it's described as firm and steady, which also helps limit bounce.
What size bedroom do I need for the Millbrook Wool Luxury 4000 in a UK king?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m giving comfortable room to walk around. New build master bedrooms can feel tighter than their measurements once wardrobes go in, so measure the floor you'll actually have left.
Should I choose the UK king or UK super king Millbrook Wool Luxury 4000?
The UK super king is 30cm wider and the same length, giving 90cm each, so 15cm more per person than the UK king. It needs at least 3m x 2.9m by our guidance. If your room fits that and space is still tight, size up; otherwise the UK king is the sensible choice.