You think that's low? We're in an end terrace, 1950s-built brick three bedroom. We run the heating 24/7/365, keeping the house at an actual 19oC. This month, we used an average of 20kWh/day in gas. I'd be mortified at 30!

If you're heating your house up from cold all the time, it's going to need the boiler running flat out each time. We find it cheaper to just leave it ticking over, along with being sensible about not opening doors/windows more than needed, having curtains closed and over exterior doors etc.
On the other hand, the 'leccy has murdered us lately. This month it was £170, and that's with LED-everything and running the bare minimum. Our background usage is about 400W in the day and 200W for 12 hours overnight (plus bursts for dishwasher, washing machine etc). Before this quarter, our whole energy bill was £90/month for dual fuel. Jumping to £170 for electricity and £80 for gas is an eye opener... We've basically gone from paying £22.50 a week all in to £62.50 a week. Not at all terrible by some standards (my in-laws on pre-pay spent that a week even before the rises!), but it's a jump nonetheless!
Edit: Weekly maths fail (no coffee yet).