What you're actually getting
For a single at under £70, this is a hybrid mattress with individually wrapped pocket springs and a gel memory foam layer on top. That combination matters. The springs give you support and some bounce so you don't feel like you're sinking into a swamp, while the gel foam handles pressure relief and keeps things from getting too warm overnight. It's a decent setup, honestly, and not one you'd expect at this price point.
Who this suits (and who it doesn't)
Personally, I'd say this is spot on for a spare bedroom or a first flat situation. Picture this: you've just moved somewhere new, the budget is tight, and sleeping on a knackered old mattress is doing your back no favours. This is the upgrade that doesn't break the bank. It's also reasonable for a kid's room as they grow.
If you're a proper side sleeper with hip or shoulder issues, I'd be cautious. Budget hybrids at this price can be a bit unforgiving on pressure points, and the foam layer probably isn't thick enough to fully compensate. Front sleepers and back sleepers will likely get on with it fine.
The honest reservation
Vasagle isn't a mattress brand you'd normally seek out. No long-term data, no ten-year reputation to lean on. The king size at £80.55 is also suspiciously cheap, which either means a bargain or corners cut somewhere. Build quality over the years is the real unknown here. For a short-term fix or a secondary bed, it makes sense. As your forever mattress? Maybe don't bank on it.