I've heard of it but think it another American commercial import. Not for me, thanks. My family has always celebrated Mothers Day but only since we've had children have we celebrated Fathers Day - I never did with my own Father and didn't know anyone else who did either. They'll be a special day for pets soon - if there isn't already. Now there's a thought!!!
To think that London, or anywhere else for that matter, does not belong to any one demographic