My son has grown out of his infant one so he's now using a family members old car seat and I can't find anywhere online that says it can go rear facing :( I really wanted to rear face long as possible but I just can't afford a brand new car seat rn and feel terrible but he barley goes in a car maybe 3 times a week for 10 minute during :/ anyone know if I can put this rear facing ?😭

I'm getting a loan my child's safety is most important does anyone know a car seat that goes rear facing for up to 3/4 years ?? I can't find one that isn't ridiculous price I'm looking for £150/£200 mark