Pan F when ever possible and Ilfachrome colour in 35mm and FP3 in 5 X 4.
In my late teens, early 20s, there was a shop on the Edgeware Road that sold ex RAF lenses plus the sort of lenses that fitted on a lens board for bellows cameras
As an apprentice I started in the aircraft jig shop, which eventually closed. The mangement wanted to transfer me to the tool room but would not pay the TR rate for my age, so the union said no.
I spent 18 months on full pay doing whatever I wanted, and I made a 5 X 4. Mahogany case, aluminium lens board, double extension rack, all brass fittings and I bought the plate back from the ex RAF stockist.
35 mm is great, but the definition on the larger formats is vastly better.
Roy.