Just found this...it must go back at least thirty years. My old tug named 'Berius', she started off as a Graupner Bugsier, but for some reason during the building of it I changed the superstructure.
She had working lights, steam whistle, and a firing tow hook made by Graham Sheppard (now of Hunter Systems)...or was it Dave Diplock? Think my memory cells need recharging...
She's pictured here on Princes Park Lake, Eastbourne.