Know there is lots of negative stuff posted about how awful Londoners are especially when you're travelling around the capital. I have found the opposite - have been travelling by tube/train quite alot lately with dd aged 1 in her buggy. I have never had to carry the buggy up steps alone. Somebody always offers/insists on helping. Men, women, old, young. Most people are friendly and dd makes the most interesting friends. I always got offered a seat when obviously pregnant.
(nb made sure I NEVER travelled with buggy in rush hour.)
Last month I stayed with a SAHM friend with 2 under 4's in Paris. We took dd in her buggy on the Metro and it was awful. Nobody helps, ever. If you want to get your buggy through a ticket barrier you have to queue up as if to buy a ticket rather than there being someone there to let you through as in the Underground. People were rude and bolshy about letting us on trains, one woman shoved me out of the way. My friend assured me it is always like this for her, and she has lived in Paris for a while.
So vowed never to moan about the tube again!