TL;DR we have a hot tub in a covered area outside and want to take measures to mitigate against harm to us or the electrics if a storm strikes us unawares. (We’d get straight out of course.)
What measures can I take to reduce the risk of harm?
More context / background:
We have built a pergola which is a simple wooden structure at the end of a high-walled garden. The wooden roof with corrugated plastic on top spans between the end garden wall and four posts, and clears the side walls by a couple of inches. It is mostly dry except for the side walls (driving rain comes in but is managed by drains under decking floor). We have run some cables under the roof and around the outside for mains lighting and data (external grade lighting, wireless, some automation sensors) terminated in suitably protected IP rated boxes.
Inside the pergola is a jacuzzi style hot tub made from acrylic. It is powered from a consumer unit and 32A mains isolator located in a brick-built cupboard within the pergola, of course this was carefully designed to be dry at all times. 240V mains is fed from the house, the underground wire is suitably protected SWA. We have other appliances (fridge etc) in the covered area.
In London we have fair weather: rainy sometimes but very rarely do we have electric storms. My point is that if there is an electric storm we won’t be expecting it, it may happen once every two years. I understand the hot tub must not be used in an electric storm, but we use it regularly during rainy periods under the dry pergola.
There is a small chance that we may be in the hot tub when a storm strikes, likewise it could be in the night time and I would therefore not be able to turn off the feed to the pergola to protect equipment.
I have also run 4x CAT6 external cable to the area and installed wireless. I mention this in case these incoming cables can be protected.
What measures can I take to protect the wiring, the equipment, and us, from an unexpected electric storm?