In England & Wales under Approved Document B, [from 2000] they are required, along with 1 interlinked smoke alarm per floor, but its dependent on kitchen layout, so not all are caught.
If there's a door between kitchen & escape route it isnt mandatory;
my view is that even if door is installed, its highly likely the doors will be left ajar/open, so negating implied benefit..of it being partial fire stop.
SCOTLAND still has no H/Alarm requirement but their causes of fire show kitchen location as the source of most Residential fires; recall in last ODPM figures I saw it was 57%.
In US they do permit smoke alarms in kitchens however Mark, on assumption
that they have much larger kitchens, better air circulation.
Are heat alarms fitted as standard in new homes now?