Thanks Philjo - The Wiki entry is an old copy taken from my One-name website.
I have since had contact from someone who actually once lived in the house (as well as finding Harry's niece-in law who is in her 90th year), so have made more progress about the interior design and the background to Harry's ideas about his heritage and have more photos. The website has been updated.
For those interested, Harry Shelvoke believed he had some manorial connections back in Shropshire. He called his house 'Melverley' after the village and some lands once owned by the Thornes of Shelvock. Unfortunately the manorial arms adorning the inside of his house in Letchworth (no doubt made at the S&D factory) were the legitimate arms of the C15th Thornes of Shelvock & Melverley with "Shelvoke" written under them. The Shelvoke's had no rights to bear these arms. All this has been confirmed through correspondence with college of heraldry in London.
In Victorian times, it was apparently quite a popular pastime to have family research back to famous figures and nobility (as the 1826 work "The Story of Grace" also attests). Not withstanding his engineering achievements, Harry Shelvoke appeared to have been either a historical romantic or fantasist concerning his own roots. As a self-made man from humble roots, perhaps the grandeur appealed to him.
If anyone has more stories about Harry Shelvoke, I would be pleased to receive them.
Regards,
Mark Grace