Millipedes like the one in the photo are totally harmless; they feed on rotting vegetation - centipedes are however, not harmless at all! They have a very painful bite/sting (not sure which)
@Paulos_the_fog Sort of yes, but more yellowy, much thinner body...lives in the soil.
@Paulos_the_fog It most certainly wasn't one of those as both children would have gone screaming into the house! It was tiny, orange, multi-legged...probably a centipede...we get them in the soil here in the UK.