DS3 is 18 months and not walking. DS1 walked at 14-15 months, DS2 not until 20 months, so although I know it's at the late end of the scale, it doesn't feel abnormally late to me!
I'm only really asking now because MIL, who lives in the US, asked last night why we hadn't taken him to a paediatrician. My immediate thought was that they probably get referred too early there so that someone can make money out of it, but I'd like a more grown up response so that we can tell her when HVs or GPs would usually suggest a referral.
DS2 was never referred and our HV was aware he wasn't walking until 20 months, so if anyone knows what the current guidelines are I'd be grateful for the information.