White Knight actually makes gas dryer from awhile, they're less a rarity in the UK than they're in the rest of Europe...funny because as you say UK is one of the "luckiest" countries when it comes about electricity costs vs the gas...
UK perhaps is the first country in the EU manufacturing gas dryers for home use, there was Miele also but they were semi-professional models IIRC, they costed crazy for what they were and at least here they never showed up in a considerable number.
Here in Italy electricity costs crazy and gas dryers are the only cost effective way to dry clothes automatically...not a case most italians just hang laundry and dryers are not a common thing because of electricty costs.
Dealers of gas dryers over here sell white knight machines also along with american models, but american models goes for the most, they cost much but also are more for your money compared to the white knight.
I had an electric white knight dryer for a while...and it was a nice little dryer, I just disliked the door grille that would collect lint and do a mess on the floor as you opened the machine.
