I've never seen a British fireplace like that, some have a fire basket some do not, some have a back boiler which heats the water but most do not. modern UK houses (last 25-30years) have neither fireplace nor chimney and are all electric.
They are cheap, which makes them a popular choice.I never seen a LPG fireplace in a home, seen em in fancy restaurants, we had oil burning heaters and fireplace (wood) wood/coal stoves but never a LPG fireplace. Is that what they put in new homes now? or I don't get out enough :-/