Electric Usage - Question

Good Evening All,

I'm after some feedback from others. Long story short, I've moved from one property in a large 3 bedroomed house and using 150kw per month in Electricity, now since I've moved to a new property which is MUCH smaller but now using 350-400kw a month which is a HUGE jump. Yes we only get billed £110 for electric a month (with the daily charge included).

The difference being from old house (Built in 2011) to new house (Built this year we were the first tenant), the old place had a GAS shower now it's an horrible Mira Jump Electric shower, and the old meter was a standard meter whilst this new one sends readings to Octopus every 30 minutes so we can see them online.

We don't have any special appliances or devices, we have a single 42" TV, an Xbox thats never on, a single phone charger, all lights switched out to 40w lights, a laptop charger to charge my laptop thats about we live very barebones, even my guitar amp it's a 3w portable charger with a battery inside so we can charge it and it last ages. Everything switched off at the plug. You think it I've done it.

We took our appliances with us, apart from the cooker/hob/extractor/boiler (central heating) since they belonged to the landlord and stuff we obviously can't move.

We noticed that our shower uses alot of electric, so my partner likes to have s long soak 20 minutes and that can used up to 2-4kw per shower with the extractor fan on since we don't have a window in our bathroom.

I've been asked to do a "creep" test, meaning turning everything off at the fuse box and see if the readings so go up and we did for 5 hours on tuesday since I was defrosting the freezer for xmas and it did go up every so slightly under 1kw in total but it was used.

I'm just after thoughts and info...