Hey Spanner,
Presume you have considered the ATP...?
Same capacity as the ATR 72 but with lower fixed cost to amortise.
West Atlantic - (merge of West Air and Atlantic Airlines) have 43 of them - and can offer full turnkey packages from full Wet thru Wet to Dry to a complete Dry lease with all training, support, etc.
They also have a couple of ATR 72 cargo on their books too if you really need that specific product.
Try their UK commercial address at:
[email protected]
Good luck.