190-metre (623 feet)
That’s the height of Kent and Essex pylons either side of the River Thames. The span is 1372 metres (4501 feet), the minimum height of the conductors over the river is 76 metres (249 feet)
So @Steviegeek doesn’t get confused 
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Every single one ?
across two whole counties 
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No, silly, the two crossing the River Thames
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Ahhh silly me 
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Mere babies
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Well, the Thames ones are 56 years old!!
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Height is related to wire span, so other than special cases like the Thames, you can judge height from spacing of the pylons and comparison against known pylons (ones you can measure by flying up next to them). I’ve not found any that I’m not well clear of at 120m!
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As a general rule of thumb, National Grid’s pylons are a minimum height of 118ft (36m).
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Just a thought, but also consider the Electro Magnetic interface around these things!
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Perfectly safe @SteveM
Just look how many videos have been posted here of members accidentally flying through the lower lines 
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In my defence if the live feed back to my phone was sharper I’d have seen it 
dji fault
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When you fly your drone near high KV power-lines, an invisible interference is exerted on your drone. This makes flying extremely difficult. A layman can compare this interference to a Wi-Fi network. Greater the distance between your drone and the power-lines, lesser the interference.
Remember that you cannot use a consumer drone without ferro-magnetic protection for power-line photography. Flying your drone near a high voltage power-line will simply fry up your flight controller!
Ferro magnetic resistance measures how much resistance a drone is capable of handling. The Phantom 4 Pro, for instance is known to have greater ferro-magnetic resistance than an Inspire 1 and Inspire 2.
You are likely to face less interference and problems if you are flying above or beside the power-lines. However, if you are flying in-between power-lines, flight interference will see a huge spike. It is advisable to maintain a distance of 100 feet from a power-line at all times.
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Lol, I purposefully didn’t name any names 
Don’t worry though @its.steves.shots you’re not the first, won’t be the last 
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Oh boy… I’m not taking that bait 
From a safety perspective, and a common sense perspective, I couldn’t agree more 
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You do realise ferromagnetic is the magnetism of ferrous (iron) materials.
It’s an electromagnetic field around power lines.
It’s more likely to cause a compass error or some TBE if you get close enough.
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Guess my flights round Drax are no no’s then
Knock yourself out then, may I suggest an RFI meter next time you are near one or listen to the crackle of the HT lines, or the usual signal interface warnings on your controller…
Definitely NOT perfectly safe, or clever or even remotely a good idea…not least the fine you’d get fir damaging the HT lines, potentially knocking out the local grid…yes perfectly safe my arse! 
Never had one (anywhere!!) … despite flying around/near overhead cables.
Get real! If they can dangle these cradles with two+ guys in them and get past H&S … drones would need to attack them with something more than plastic props to cause damage!
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Does it really matter? Flying, going, near power lines is dangerous. The consequences of hitting a power line with your drone doesn’t stop with your drone being damaged. It could affect further afield than just your loss. But hey, what do I know?