Britax Evolva 123 Plus Car Seat, Black Thunder

Product information

The Evolva 123 Plus car seat from Britax grows with your child from 9 to 36kg which is approximately 9 months to 12 years.

It's designed with a 5-point harness which has a simple one pull adjustment for children from 9-18kg and features a Click & Safe™ audible system, which lets you know when the harness is securely fastened. The harness is height adjustable and so is the head rest, providing ultimate protection and comfort.The seat has side impact protection with deep, softly padded side wings.

For children 18kg upwards, they will be able to use the car's 3 point seat belt instead of the 5 point harness, to secure both child and seat to the vehicle. The seat shape has been carefully made to ensure that the lap belt sits in the correct position when the chair is used as a highback booster seat, while the seat belt guide correctly positions the diagonal belt when in booster seat mode.

The Britax Evolva 123 Plus also features practical harness retainers which keep the harness out of the way when your child is getting in or out of the seat. The upright and recline position provides comfort on long journeys and the additional pull out drink holder and snack tray come in handy when feeding hungry passengers.

Additional features for the Plus:

-Click & Safe® audible harness system clicks when the harness tension is correct
-Pull-out drink holder and snack tray
-Quick-remove cover without interfering with the harness
-Adjustable width positions to fit different body types

All our car seats and infant carriers comply with current European regulation ECE R44.04.


  • Under no circumstances should a car seat be used on a passenger seat where there is an airbag.
  • Correct fitting of all car seats and boosters is of paramount importance to make them most effective in the event of an accident. Not all car seats fit all cars and it is important to check for fitting suitability on all cars you intend fitting the seat to, as well as re-checking if you change your car.
  • Always read the instruction booklet which comes with your car seat to achieve a safe and correct fitting, retaining the guide for future reference. We recommend fitting your car seat in advance of first using it.
  • We recommend that babies shouldn`t be left in Group 0/0+ car seats (infant carriers) for prolonged periods.



  • Please make sure that you check the car seat you choose is suitable for your car before ordering.
  • To find out if a car seat is suitable for your car, please contact the manufacturer or the Nursery department in John Lewis department stores (except High Wycombe):
  • Click here to find your nearest department store


Car seats are categorised into the following groups and it is imperative that a category is chosen so the child`s weight falls within the range indicated:

Car Seat groups:

Group Child's weight approx. age of child
0 birth up to 10kg/22lb birth up to 6-9 months
0+ birth up to 13kg/29lb birth up to 12-15 months
0+ & 1 birth up to 18kg/40lb birth to up to about 4 years
1 9-18kg/20-40lb about 9 months to 4 years
1 & 2 9-25kg/20-55lb about 9 months to 6 years
2 15-25kg/33-55lb about 4 to 6 years
1, 2, 3 9-36kg/20-79lb about 9 months to 12 years
2 & 3 15-36kg/33-79lb about 4-12 years

Note: some car seats will be approved in two or more groups.

H52 x W47 x D60cm
Eligible for International Delivery
Facing position
1, 2 and 3
Isofix compatitble Information Isofix is a system of dedicated attachment points in the car which car seats can be locked into. We recommend checking your car handbook for further information.
Manufacturer's Warranty
24 months
Reclining positions
Suitable From
9 months
Weight Information Unpackaged weight
Weight or height of child
9-36kg or 20-79lb

Brand Story

Based in Andover, Hampshire, the BRITAX company was founded in the 1930s, focusing initially on adult seat belts and in the 1960s launched the company's first child car seat. The company expanded greatly in the 1980s and 1990s to countries including the USA, Australia, New Zealand, Scandinavia and the Far East. Since the 1970s, BRITAX has repeatedly come up with successful innovations which have influenced the entire market, setting new standards for the industry: such as the BRITAX ISOFIX anchoring system, which was developed in 1997 in co-operation with VW, and has since become an international standard. BRITAX also launched the first adjustable child seat, and the first ever baby carrier that was designed especially for newborn passengers.


Click & collect

FREE on orders over £30, £2 if you spend less. Collect from John Lewis or Waitrose tomorrow from 2pm
369 participating John Lewis and Waitrose shops

Standard delivery in 5 working days


Named or Saturday UK delivery


Named day UK delivery pre-10.30am


International delivery not available

We want you to be happy with your purchase. If you're not, depending on the type of product, you can make free returns in the UK via John Lewis shops, Royal Mail, Collect+, or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454. Find out more about returns.

You'll find returns information on your delivery note. Unless faulty, we'd like you to make your return within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.


Find out more about returning products

Q & As

Rated 5 out of 5 by 6 reviewers.
Rated 5 out of 5 by Great car seat!! This car seat has been very well thought out.It is sturdy yet comfortable with excellent side protection and well made seat straps. A little fiddly to put in place but gets easier with time. 16 September 2014
Rated 5 out of 5 by Excellent car seat This is a good quality, comfortable car seat and my little girl who's almost 2 loves it. It fastens easily and reliably. Am very pleased with this product. 02 June 2014
Rated 5 out of 5 by Excellent quality car seat From very first use my daughter liked it and falls asleep very quickly when we use this seat. Her group 0+seat it took her while to get use to it unlike this seat. We bought this seat after a lot of research and we are very happy with it. 25 March 2014
Rated 5 out of 5 by Excellent for safety and price Brilliant. My little 3 yr old Grandson is really comfortable in this. Excellent with the cross straps that stop his head lolling forward (unsafe and uncomfortable) when he falls asleep. And he does as this is a really comfy, soft and well padded seat! Oh how I wish I had found this when we first had to buy seats as this goes from baby to 11 years (Stages 1,2 and 3) so fabulous value for money! Highly recommend! 14 March 2014
Rated 5 out of 5 by So Good We Bought 2 The Britax Evolva 123 Plus is versatile and very quick to install. It grows with your child and is very easy to adjust. It certainly gives us peace of mind when travelling with the great safety rating that it has. 16 February 2014
Rated 5 out of 5 by Fab seat Bought this car seat for our 2nd car and very pleased with this purchase. The seat is comfy, sturdy and secures our son safely. The cup holder is a great addition and the seat also looks very nice. Great purchase. 06 May 2013
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Additional services

  • 2 year guarantee included

Out of stock