The one below is what I used and it is super light and affordable! Can be used with or without isofix. https://www.johnlewis.com/maxi-cosi-cabriofix-i-size-baby-car-seat/essential-graphite/p6090166?s_ppc=2dx_mixed_fashion_BAU&tmad=c&tmcampid=2&gclsrc=aw.ds&gad_source=1&gbraid=0AAAAAD2el1xclTFkV7wc032WgYUUlWFbX&gclid=CjwKCAjwwqfABhBcEiwAZJjC3vc453Iok1rAxzCjOfHcfisGGRBAmMGAKRzNqBrr2wNRYBokvKmHeRoCA_oQAvD_BwE
We have the Avionaut pixel pro, it's only 2.5kg also the Avionaut cosmo is around 3kg and reasonably priced
Thank you 🙏🏽
If you look on this website these are the best and safest car seats available x https://saundersandsmalls.co.uk/collections/baby-seats https://www.safejourneycarseats.co.uk/?fbclid=IwZXh0bgNhZW0CMTEAAR7l7hEsQ7lN2zSP5yEVkmu31FXGQIFNDel9-s8InWsF6TglXuuGCjmpyDNEUw_aem_krgULS6efLkmwRwSLtaC9g