There is this, Jalima www.johnlewis.com/british-baby-box/p3356023
The boxes on sale comply with the only existing standard that does exist, that for the mattress. ^"Foam mattress covered wit a removable, machine washable Corovin cover (complies with BS1877 Part 10:2011+ A1: 2012 and BS7177:2008 + A1: 2011)^" This does not mean that they are unsafe, more that there is no official standard to apply to them. There is no official standard for a baby asleep on a sofa either, which is potentially far more dangerous, with no sides at all to keep them in.
The rest of the advice given on the John Lewis page is essentially the same as that given in Pollaidhs link, some of it in the exact same words.
"WARNING - please read:
Always use in a child safe and supervised environment.
The Baby Box is suitable from birth to 5 months. This product is only suitable for a child who cannot sit up unaided. When a child begins to sit, kneel or to pull themselves up (this may occur before you baby is 5 months), the Baby Box should not be used anymore for this baby
Only use a firm, horizontal level and dry surface to place the Baby Box on.
Do not put the lid on the box if your baby is in it. The Baby Box is not designed for use with a stand.
The Baby Box is not made for carrying babies around, always ensure your baby is removed from the Baby Box before transporting the baby from room to room.
Do not use if any part of the baby box is damaged, damp, wet, torn or missing.
^ BABY BOX IS A SINGLE USE ITEM - DO NOT USE FOR A SECOND CHILD "^