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PIR cost would be invisible. Barely a couple of £ over the whole year.
Light bulb cost can be calculated here https://www.electricalcounter.co.uk/light-bulb-running-costs
What bulb type do you have? LED makes sense for communal area
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It might be an LED or possibly just a bog standard old 40w bayonet bulb I had around as I remember changing it a few years back. It is on at max a couple of hours a month if that. The PIR might be on more due to the family of foxes that run past in the night. I'm fine with the old bills at £90 (which were split two ways) but £1450 is taking the piss.
There was some talk about leaseholder Vs freeholder. I'm a long leaseholder and currently in "discussion" with the freeholder who are a large London based housing association over service charges and communal electricity bill. Most of the time they're ok, like a silent partner who randomly writes letters and S20s
Some background, my flat is one of two 2bed flats in a converted house. Communal area is a v small hallway off the shared front door.
Electricity bill for about 3 years was consistently around £90/year. 2019/2020 it went to £750 and then last year 2020/2021 it went to £1400. For the communal electricity alone!
As you can imagine I'm not happy and they don't seem in any rush to rectify. I've got someone who has at least asked for the meter reading last week and so will follow up at the end of this week. I'm not sure if they think our property is a large block of flats so they just tried their luck but it seemed to be a random doubling of cost from last year. For one internal light and one external PIR I'm damn sure they wouldn't use that much leccy unless we're powering the whole street.
Any way, rant (for the moment) over.