I occasionally test building facades with the help of a Rolls Royce Griffon at Vinci testing facility in Leighton Buzzard. Great sound, it used to be at Taywood Engineering. Another test facility in Telford called UL Solutions formally Wintech has a DC6 Double Wasp for same purpose a different sound but equally pleasant. Both are very smoky when starting and shed quite a bit of oil.
Cheers
Mr Mac