As we cannot buy roundup or anything similar here now, I found a natural weedkiller.
But be warned, once used on the ground, apparently, nothing else will grow / which is great for my rather large gravel area.
The recipe is for a gallon, so we-ve made it into litres, as that-s a hek of a lot of vinegar
4.55 litres of vinegar
one normal cup of salt
one tablespoon of salt
Mix it all together and spray / works wonders
Saves me sitting on my bottom several times a year, pulling up all the weeds from the gravel.