It could be Harry the Heat from Lincolnshire. I did have his card and e-mail at one time but cannot put my hand on them at the moment. I think his name is Harry Spicer but not sure.
I might well go to the Northen Jumble on Sunday and do want some Eberspacher parts .If I go and "Harry the Heat" is there will get his details for you.
I bought a D1LC compact second hand from the following ad:
"Eberspacher Air Heaters D1LC
1.8kw, 12volt, Diesel, Economical, complete with full fitting instructions, and in excellent condition.
Can be seen running at our workshop. Telephone 01842 813446 or Mobile 07990823143 Price £250+delivery"