Development History of the X Type

Knowledgeable piece on the X400.

Seems the site can’t be reached?

Worked for me, and I must say I found it very interesting. Thanks to the OP
Cheers, Alan

Nope still not connecting, country specific site perhaps?

Got me. Im in the US, appears to be a UK site.

Cheers, Alan

I was able to open it. Long, detailed, but very interesting article. Worth the read.