I'm afraid it is true this is on the Deep Red site:-
"It's with considerable sadness that I report Ian Lang passed away on the 29th of March 2019 after losing his battle with a long term illness. This site will remain online as a memorial but will not be updated.
Thank you to all those that contacted Ian with questions and thanks. Your emails from around the world gave him great joy.
Just read on another forum that very sadly Ian has passed away, I have no way of confirming this. If it is true he will be sadly missed, as his blog was a source of inspiration for many self builders. Thoughts are with his family.