Parents are being warned not to buy a £400 children's car seat after it failed safety tests by a consumer group.
The Nuna Rebl i-Size, which is one of the most expensive seats on the market, was tested by reviewers at Which? who claim it could put children at 'high risk of serious injury' when used in the reverse-seating mode.
The manufacturer advertises the Nuna Rebl i-Size as being 'safe and sound for little one's' on its website.
Which? carried out crash tests with the seats using dummy representing a three-year-old .
The damning review said: "The Nuna Rebl i-Size scored so badly in our front-impact crash tests when tested rearward facing with a crash test dummy representing a three-year-old, that its score was downgraded overall, making it a Don’t Buy.
"The crash-test results indicate that an older child using the Nuna Rebl i-Size child car seat in rear-facing mode could be at high risk of serious injury in the front crashes we simulated.
"We don't recommend you buy this seat if you're planning on using it as an extended rearward-facing car seat."
The manufacturer, whose products are designed in Holland, have since said it will offer refunds to unsatisfied customers but won't recall the product because it 'meets and exceeds all the relevant UK government safety standards'.
Nuna said in a statement: "We do appreciate that the ADAC independent body testing has shown that the REBL experienced an issue when it was tested above and beyond what the certification that the seat carries.
"The REBL is an ECE R129 seat and has passed all of the European tests required for the seat to carry this certification.
"These standards are created by the United Nations Economic Commission for Europe (UNECE) and the i-Size certification is accepted in over 60 countries world wide and seats do undergo rigorous test in order to qualify for this certificate.
"It is not a bare minimum test, it is what all Car Seats within that category comply with.
"We at Nuna are very careful to make sure that we would never sell a product that would not pass the certification that it has been awarded and we ourselves make sure that we, in our in house test facilities, test every seat before it is put forwards for the certification.
"The R129 standards are tested by the Department for Transport prior to a seat receiving this certification.
"ADAC are a German Automobile Club who conduct tests independently outside of the UK Government mandated guidelines for the I-Size certification requirements.
"We would like to reassure you that the REBL is and always has been a safe car seat for your little one to travel in."
It added in a Facebook post: "We will not be conducting a product recall unless the recognised relevant national authorities deem the seat is unsafe."
Nuna said those concerned should call them directly to discuss and those who want a refund should make contact with the retailer where they bought the seat.
The Which? review has sparked outrage with parents on the forum mumsnet and Nuna's Facebook page, who are demanding the manufacturer withdraw the car seats.
Gisele Dodson posted on their Facebook wall saying: "Surely Nuna should be issuing an immediate recall and offering refunds??
"Come on Nuna what are you playing at.
"Every single one of your calls and emails will be people asking for a refund. No one is going to take your word on the safety of this car seat now."
Helen Coupland added: "You need to recall this seat, there is no way any of us parents will be putting our children in it."
Mumsnet user 'FruitBadger' wrote: "Very disappointing, for a product with a premium price tag I'd expect a premium performance."