Dallas
With the state of the RAF's AT fleet and the lack of in-theatre "spokes" even C47 Dakotas would be useful additions.
Basler conversions with PT6's, modern commas and nav kit, DASS and you've got the fixed wing equivalent of a CH47 (ok it can't hover or VL) but they were built like trucks and could still be a useful asset at a fraction of the cost of a helo/C27/C130. If it's worth building new Twotters it could be worth starting with a few new DC3's/C47's........
You ought to get 4 sqns of Daks for the same cost as one sqn of Chinooks. Just think what flexibility that might offer......
MB