Part of the reason for the missing fuses. According to Simon's photo naming, this is in the "byre." (That's a cow-shed to the rest of us outside of Scotland! [Linked Image] Should have mentioned before that this is north of the border.)

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Here's the inside of the isolator shown in the first photo (note the non-standard color coding in places):
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Back to Simon's own description:
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These are all in the porch where the first 3 pics of the "consumer unit cupboards" are.

On top of the genny/mains changeover is a charged gas blowtorch
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Yes that is a plastic bottle full of two stroke next to the battery charger and yes the leads are in a bad way and yes the charger is very regularly used.

HMMMMM!!!! Hydrogen gas from batteries plus petrol fumes plus sparks from dodgy charger.