Last seen for £299 at Mattress Man on 10th November 2026
Silentnight Miracoil Sleep Double Mattress
The Silentnight Miracoil Sleep Mattress is a medium firm sprung mattress built around Silentnight's Miracoil spring system, which means a supportive, slightly firmer feel that suits back and front sleepers well.
- Suits back & front sleepers
- Support spread across the mattress
- Easy care, only needs rotating
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
More available sizes
Last seen for £299 at Mattress Man on 27th October 2026
Last seen for £349 at Mattress Man on 10th November 2026
Last seen for £425 at Mattress Man on 27th October 2026
Last seen for £299 at Mattress Man on 10th November 2026
Last seen for £229 at Mattress Man on 10th November 2026
Mattress details
Mattress
Silentnight Miracoil Sleep Mattress
Size
Firmness
Medium Firm
Construction
Open Coil Spring
Depth (cm)
Layers
Layer Details
Key benefits
- Sharing space for two: At 135 x 190cm you get 67.5cm each for two people sharing, which is workable for most couples who sleep fairly close.
- Fits typical UK bedrooms: We suggest a room of at least 2.6m x 2.8m, which most doubles-era British bedrooms meet with space for bedside tables on both sides.
- Medium firm support across the width: The Miracoil spring system gives a slightly firmer, supportive feel, which means two back or front sleepers each get consistent spinal support.
- Easy to dress: Standard double sheets and a 200 x 200cm duvet are sold everywhere, handy if you're kitting out a whole home on a spread-thin budget.
- A safe guest room pick: The UK double suits visiting couples without dominating a spare room, and the medium firm feel is agreeable to most occasional sleepers.
This size suits you if...
You share the bed every night and your room sits comfortably above our suggested 2.6m x 2.8m minimum, you're furnishing a first flat or a guest room and want a familiar brand without a big spend, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming a corner.
Consider another size if...
You and your partner both like room to move, or one of you sleeps restlessly. The UK king is 15cm wider and 10cm longer, and we'd recommend it if your room allows at least 2.7m x 2.9m.
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FAQ's
Is the Silentnight Miracoil Sleep in a UK double big enough for a couple?
For most couples, yes. Two people sharing get 67.5cm of width each, which is comfortable if you sleep fairly close and settled. The medium firm Miracoil feel keeps support consistent across the mattress, so neither of you rolls towards the middle. If one of you is broad-shouldered or restless, the UK king's extra 15cm of width may be a better fit.
What size room do I need for the Silentnight Miracoil Sleep in a UK double?
We suggest a room of at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves space to walk round the bed and open drawers, and in most rooms of that size you'll still fit bedside tables on both sides. This is our guidance rather than Silentnight's, so measure your own layout before ordering.
Should I choose the Silentnight Miracoil Sleep in a UK double or a UK king?
It mostly comes down to room space. The UK double is 15cm narrower and 10cm shorter than the UK king, so it suits rooms where a king would feel cramped. If your bedroom allows at least 2.7m x 2.9m and you share every night, the UK king gives each of you noticeably more shoulder room for a modest step up in footprint.
Is the UK double Silentnight Miracoil Sleep a good guest room mattress?
It's a strong candidate. The UK double handles visiting couples, which a UK single can't, and the medium firm feel suits the widest spread of sleepers for occasional use. Yes, lightweight side sleepers may find it slightly firm at the shoulder, but for a bed used a few nights a month that's rarely a deal-breaker.
Where can I find the best price on the Silentnight Miracoil Sleep UK double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them, so you're seeing current figures rather than a snapshot. The UK double sits mid-range in this model's lineup, and because the double is the most common UK size, availability tends to be steadier than for the larger sizes.