@mattyk2010 I would suggest The GAS Mods Kree. IF Direct Lung is the requirement then this would fit the bill and it is a Tiny Little thing when run in 2ml mode
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Comes with the Poly Extension Tank which increases its capacity to approx 3.5/4.0ml
Bags of Air, but Air is Fixed so any adjustments are from under coil inserts. £24 ish depending on where you go. Sadly I opened the box when my second arrived, so it isn't Mint as the cellophane wrapping has gone, otherwise I could have supplied one.