The law regarding child car seats is a bit of a minefield, tbh
Have a read of this - www.gov.uk/child-car-seats-the-rules/using-a-child-car-seat-or-booster-seat
Personally, I would never put my grandchildren in anything other than professionally fitted car seats. Professional fitting is essential, because not every seat will fit every car correctly and safely. Unless you know exactly what you are doing, you may end up driving your grandchildren round with next to no protection, even though they are in age/height appropriate seats.
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