You had real hot water bottles ?!?!!??!!
Ha, seriously though mate, we used to fight over plastic bottles round our way, fill them with hot water and use them as many couldn’t afford a hot water bottle, but those paraffin heaters (or the little gas ones the council put in at the foot of the stairs) were an absolute godsend in winter.
Oddly about the coal fires though, as a kid always remember my Mam getting up early to get the fire going before we got up, we’d get dressed for school, have our breakfast, almost sitting on top of the fire, great days in some ways.