Dave Hewitt
Long time readers will have seen mention on many occasions of a little company called Unit Models. When I first came across them they did a range of resin bits mostly for US modellers in HO scale but what a range it was. Noting spectacular but they produced no end of useful little bits and pieces for people who scratchbuild buildings and the like. Things like vents, wall fans, lockers etc. The sort of stuff that was a bit of a ball ache to scratch build yourself. 
The roof vents you see here are from them and as they didn’t do the exact ones I needed Dave was only to happy to do some for me, he didn’t even seem to charge any extra for them either! Well Sadly Dave passed away recently and the business is up for sale. I hope someone picks it up and continues to produce this specific but invaluable range of bits and bobs and its sad to see such a lovely chap taken from us. My thoughts with his friends and family.