Arthur Sleep Emperor Arthur Mattress

Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.

A medium firm pocket spring build suits most sleepers, although lightweight side sleepers may find it a little too firm at the shoulder and hip. Pocket springs move independently, which means better contouring and less motion transfer than a traditional open coil. It's not a budget buy, but it sits in territory where you'd expect a well-made spring unit rather than a bargain-bin one. Mattressman offers free next day delivery on it, with a handling time of 0 to 1 days and transit of 1 to 3 days, so you won't be waiting weeks. Yes, the spec sheet is sparse, but the retailer's 60-night trial takes some of the risk out of that.

Couples
Pocket springs move independently, which means less motion transfer than an open coil, so one partner's tossing and turning is less likely to disturb the other.

Back sleepers
A medium firm feel gives a fairly supportive surface, which suits anyone lying on their back who wants to stay level rather than sink in.

Combination sleepers
Independently moving pocket springs contour to your shape as you change position, while the medium firm feel stays supportive whichever way you end up lying.

Heavier sleepers
A medium firm pocket spring build feels solid underneath, which suits people who want a mattress that stays supportive rather than soft and sinking.

There's no UK Single or Small Double, so it won't suit children's rooms or narrow guest beds. If you like a soft, sink-in feel, medium firm will likely feel too solid. And if you're the sort of buyer who wants full specs, spring counts and material breakdowns before buying, the lack of published detail may frustrate you.

Is the Arthur Sleep Emperor Arthur mattress firm or soft?

It's listed as medium firm, which means a supportive surface with a little give rather than a plank-like feel. That tends to suit back and combination sleepers well, although very light side sleepers sometimes find medium firm mattresses press a little at the shoulder.

What sizes does the Emperor Arthur mattress come in?

Three sizes: UK Double, UK King and UK Super King. There's no Single or Small Double option, so it's aimed squarely at larger bedrooms and couples.

Does the Emperor Arthur mattress come with a trial period?

Mattressman lists a 60-night trial on this mattress. That's the retailer's own offer rather than an Arthur Sleep guarantee, so if you buy elsewhere, check that seller's returns terms before ordering.

How quickly can the Emperor Arthur mattress be delivered?

Mattressman offers free next day delivery, with a handling time of 0 to 1 days and transit of 1 to 3 days. Old mattress removal gets a mention on the listing too, though the details of that service aren't spelled out, so ask before you rely on it.