Pete. Thanks, that's an interesting site, very similar to ours. I see from their photo that there were 2 lots of 4 masts. I can only assume that the single ones were the 1936 build which I saw, whereas the latticed pylons were an update later on. And they also confirm that these were RAF initially, with WAAFs manning before bombing & shelling made it too dangerous. The photo', taken by the Germans across the channel is quite amazing. Reminds me of the saying; And the Lord said, " let there be light". And there was light, and on a clear day, you could see for miles & miles & miles!.